Testosterone It has been theorised that rape is an evolved reproductive strategy in male primates, including humans5. Some women claimed they enjoyed bondage and being tied down because they spent so much time outside of the bedroom being in control and independent. While I'm not complaining at her tastes, I'm not sure I can see the evolutionary benefit … apart from attracting men who are dominant in bed, which, at the risk of doing myself down, seems a dubious sort of goal at best. Missionary is the most common, but you can have a lot of fun with her laying on her stomach, kneeling, or tied with her feet and wrists together. During the first half of the menstrual cycle women's testosterone levels increase. Restraining just one body part will also help ease her into the idea while allowing you both to still enjoy a mild form of bondage. Prelapsarian sex The paraphernalia of handcuffs, rope and blindfolds used by modern humans during sex inflicts passivity and a removal of freedom of choice upon the restrained one. Interestingly, a few key reasons stuck out the most: Can shackles and chains have an evolutionary advantage? Testosterone levels vary in women as they do in men. They like to keep sex interesting and think the novelty wears off when bondage becomes repetitive. They said it keeps the guy in control so he can fully focus on their needs. Studies on the sex lives of female primates have revealed that female homosexual behaviour is frequently favoured and that female primates can dominate sexual activity by initiating hetero and homosexual coitus, partaking in varied couplings and positioning and invariably experiencing orgasms9. It is possible that at these times your girlfriend experiences sex with you via the third person objective. It is possible for her to achieve a self-image as an alluring sexy female, she may perhaps wrongly believe she needs to play a submissive role. Once an adult is handcuffed and restrained the other party becomes, by default, the dominant one.