Don't get me wrong I think female friends have had sex, be it dabbling, testing the waters, playing around whatever.... but 7 years, surely lesbian bed death would have popped up on your behalf if there was no physical attraction.

* regarding the longevity of heterosexual relationships vs. lesbian. I will say this , I have been with my partner 13 years this month and when we bought our house 8 years ago 4 of our 5 neighbor friends have since divorced and moved. Heterosexuality doesn't guarantee stability and the lack of statistics and lack of true marriage recognition helps to break up some gay couples, as it becomes perpetual dating.