A study just came out in Britain that says that women who are in relationships lose their sex drives the longer they are in the relationships. As I could have predicted, the study says that men's sex drives stayed the same no matter how long their in a relationship.Besides the fact that this study easily places men and women into very stereotypical roles and seems completely willing to do that without question, this study has a few other problems as well.First, this study was a snapshot of people in relationships. They didn't follow anyone from the beginning of a relationship so that they could report what their sex drive was like then and ask them two years later. They just surveyed group of people.Second, this is self reporting. There is no objective way to measure the amount or quality of sex that couples are having. I think the quality aspect is key here. The more you get to know someone sexually, the more pleasure you have. So, even though you might not be jumping each other every time you're together, the sex is of a better quality overall.Third, this article falls into the trap of explaning the data through evolutionary psychology. This field of study explains everything in terms of what our human ancestors might have done 10,000 years ago and why we would still do that today. There may be some relevance to this but I also don't believe that humans stopped adapting (or evolving) 10,000 years ago and have remained in a "me tarzan, you jane" mentality. If women's rights, gay rights, and gender fluidity have shown us anything, it's that we're not bound to the agressive patrilocal society that we came down from the trees with.To end my little rant, these scientists explain that women desire sex less because it's advantageous for them to "withhold" sex so that it doesn't become a "given". This contradicts their own data. If men want sex 80% of the time and if they're given sex 80% of the time, they'll be happy, not go looking for someone else. This last part of the article completely supports the stereotype that women use sex as a tool to manipulate. The women I know have sex because they like it, not because they want to get something else out of it.Of course the article didn't look at any kind of sex toy use. Vibrators, cock rings and games are all ways that I watch couples bring new and interesting things back into their sex lives every day. In fact, the lead article on our website right now is about sex toys for couples. Check it out.