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**Study Design** The proposed research involves a pre-post randomized-controlled study in which participating couples are asked to incorporate the use of a vibrator into their sexual lives while experimenting with new sexual positions, or alternatively, are just asked to try practicing new sexual positions; changes in both groups will be compared to a third group of couples not be asked to modify the type of sexual behaviour they engage in. This manipulation will be embedded within a 29-day dyadic diary framework with data collection occurring primarily online, on a 2-3 day schedule. **Inclusion Criteria** A) Heterosexual couples, B) in sexually active relationships, C) of more than 3 years duration D) who are living together, E) and have reliable access to the Internet **Exclusion Criteria** A) Previous experience with We-Vibe vibrator, B) very high sexual satisfaction, operationalized as a “9” or “10” on a 10 point scale, C) very high relationship satisfaction, operationalized as a “9” or “10” on a 10 point scale D) use barrier methods (e.g. condoms, cervical caps, diaphragms) as their primary means of STI protection and birth control, E) Pregnant women who are at risk of preterm labour or miscarriage, or who are in the final 4 weeks of pregnancy **Procedure** On the first day of participation (Day 1), both members of the couple will be asked to complete an intake survey that will collect demographic information, and assess potential moderators relevant to the research hypotheses (see “SBRQ - Intake Questionnaire.doc”). These will include, previous sexual experience, previous experience with sexual aids more generally, and vibrators specifically, extent of experience with various sexual positions, personal attachment style, extent of erotophobia-erotophilia, and attitudes towards the practice of novel sexual behaviour, joint use of vibrators with their current partner, and new sexual positions. This initial survey will collect baseline measures of the outcomes of interest (e.g. relationship satisfaction, sexual satisfaction, intimacy, passion, communication), using lengthier standardized instruments that are not suitable for diary assessments. These measures are included as a redundancy, in case the shortened diary measures of the same constructs have inadequate psychometric properties to test the primary hypotheses. Beginning two days later (Day 3), and occurring three more times in 3-day intervals (Days 6, 9, & 12), each member of participant couples will be asked to complete a brief 10-15 minute diary survey, alone and in private to provide baseline data before the study manipulation is introduced (see “SBRQ - Diary Assessment.docx”). These surveys will ask participants to report the extent of their sexual behavior since their last survey, focusing particularly on extent of solitary and partnered sexual activity, and the use of vibrators, and other novel sexual positions. When participants report any partnered sexual behaviour, additional questions will also be asked, including the extent that participants’ enjoyed the experience(s), and the extent that they were novel or mundane. If participants also report that vibrators were used with a partner, they will be asked about the type of vibrator(s) used, the extent that it helped achieve orgasm for one or both partners, and the extent that vibrator use was a an enjoyable and novel experience. Participants’ current perceptions of intimacy and passion towards their partners will also be assessed, as well as their sexual and relationship satisfaction. Participants will be asked to complete all diary entries at approximately the same time of day. Fourteen days after initiating the study (Day 15), couples will be asked to visit the social psychology research laboratory for a “sexual relationship workshop.” Here they will meet with a female research assistant who will first have them complete a fifth diary survey, identical to the ones described above. In sum, these five diary entries will provide baseline data describing patterns of pre-intervention sexual behaviour, vibrator use, and fluctuations in intimacy, passion, and sexual and relationship satisfaction, and will be used to test the primary hypotheses of the study. Following the 5th diary assessment, participants will complete a more comprehensive measure of recalled sexual behaviour covering the first two weeks of their participation (see SBRQ – Sexual Behavior Assessment.docx). This measure will be compared to the baseline measure of recalled sexual behavior to determine if reports of recalled sexual behavior differ following daily diary reports of sexual behaviour during the control period. Once these two surveys are complete, couples will be randomly assigned to receive a vibrator use intervention, a sexual positions intervention, or a control intervention. All interventions will begin with a basic lesson regarding sexual anatomy, erogenous zones, and sexually sensitive areas, which will be pointed out on anatomically correct props (see “SBRQ – Props.docx”; “SBRQ – Sexual Relationship Intervention Script.docx”). All interventions will conclude by asking participants to engage in a minimum of 5 sexual encounters with one another in the final two weeks of study (to ensure that enough sexual behaviour takes place to introduce novel sexual behaviours and the number of prescribed sexual encounters is equivalent across conditions). In the vibrator use intervention, couples will be given a vibrator designed to be used during heterosexual intercourse (e.g. We-Vibe 4), instructed in its use, and asked to incorporate it into their sexual activities over the coming weeks of the study. The vibrators used in this study have a unique design that will be unfamiliar to most participants, even many of those with previous experience with vibrators, and basic instructions regarding the mechanics of intended use will be imparted using the anatomically correct props. Additionally, the makers of this vibrator have assembled a creative guide (see “SBRQ – Playbook.pdf”) that offers ideas on how to incorporate the use of vibrator into various exotic sexual positions, and participants will be encouraged to try 5 of these positions while using the vibrator with their partner. In contrast, couples in the sexual-position intervention, who will receive the same introduction to the intervention, will not be given the vibrator at this time (though they will receive one at the end of the study as compensation), and instead, will receive a slightly modified discussion regarding sexual positions discussed with couples in the vibrator use intervention, and asked to try 5 of these positions out in their future sexual encounters. Finally, couples in the control condition will only receive the introductory discussion regarding basic sexual anatomy, erogenous zones, and areas that stimulate sexual pleasure. These couples will receive the gifted vibrator and Play-Book at the conclusion of the study. Previous research has found that most couples will follow-through with simple requests to incorporate a vibrator into their sexual encounters, and participants have generally evaluated such experiences positively (Murray et al., 2012; Watson et al., 2012). Two days following the intervention (Day 17), couple members will be asked to continue completing a second regimen of 4 diary surveys (see “SBRQ - Diary Assessment.docx”), occurring in 3-day intervals (Days 20, 23, & 26). These diary surveys will be identical to those used previously, and will be employed to gather post-intervention information regarding sexual behaviour, vibrator use, and current perceptions of intimacy, passion, and sexual and relationship satisfaction. On the last day of participation (Day 29), participants will complete a final diary survey, and together, these 5 diary surveys will be used to test the primary hypotheses of the study. Relative to the control condition, it is expected that couples in the vibrator use, and sexual positions interventions will report engaging in more novel sexual activities, and will report higher intimacy, passion, sexual and relationship satisfaction and improved sexual communication around days in which they engage in such activities. As the vibrator use intervention constitutes an attempt to manipulate sexual novelty on two fronts, it is expected that couples in this condition should report having the most novel sex, and may report having higher intimacy, passion, sexual satisfaction, and relationship satisfaction and better sexual communication than couples who will receive the sexual positions intervention. While no gender-specific hypotheses seem warranted at this time, because of the dyadic nature of the data, hypotheses will also be explored within a dyadic actor-partner statistical analysis framework. After completing the last diary entry, participants will complete an exist survey designed primarily to gather secondary measures to test the primary hypotheses with more extensive standardized instruments that are not appropriate for diary assessments, and to gather more information about couples’ incorporation of novel sexual behaviours into their sexual encounters (see “SBRQ - Final Questionnaire.doc”). Specific questions will assess the type and number of sexual behaviours tried, the initiation of other novel sexual behaviours not targeted by the intervention (e.g. shared pornography use, etc.), and perceptions of these experiences. Participants in the vibrator use and sexual position interventions will be questioned specifically about their-perceptions of the impact of the intervention on their relationships, and the extent of communication surrounding the introduction of new sexual behaviours into their sexual relationship, using a combination of both qualitative and quantitative questions. At the conclusion of the study, participants who did not receive a vibrator or sexual positions manual during the intimate play workshop will be given one to ensure equitable treatment of participants. To this end, participants will be sent an e-mail including debriefing information (see "SBRQ - Debriefing.docx") about the study, along with instructions on how to obtain their materials. **References** Murray, S., De Santis, C., & Milhausen, R. (2012, May). Examining the effects of prescribed sexual activity on couples’ sexual and relationship satisfaction. Paper presented at the 2012 Joint Meeting of the Eastern and Midcontinent Regions of the Society for the Scientific Study of Sexuality, Bloomington, Indiana, USA. Watson, E., Seguin, L., Murray, S., & Milhausen, R. (2012, May). Men’s perceptions of a sexual enhancement product on their and their partner’s sexual satisfaction. Paper presented at the 2012 Joint Meeting of the Eastern and Midcontinent Regions of the Society for the Scientific Study of Sexuality, Bloomington, Indiana, USA.