According to a post on dating site Okcupid.com's blog, iPhone users are more sexually active than other smartphone users. OkCupid looked at iPhone, Android and blockberry users between the ages of 18 and 40 who are on members of their free dating site.
Here is a link to the full article. The blog post also has interesting data on what cameras make you look more attractive (hint it's not a phone camera.) Special thanks to Olivia for bringing this article to my attention