No, but I'm astounded by how many do. I know women who complain that their husband wants sex, and all I can think is "Did you think he married you because he wanted an expensive room mate?" (and considering how these women look, they are lucky their husbands show them any interest). I have two friends who sleep in their kids rooms, because they think sex is gross with their husbands. I feel like me and my ONE girlfriend who also enjoys sex are in hiding, because we can't admit we find them baffling and don't know why anyone would stay married if the marriage was DB without being VERY ostracized (none of these other women would talk to us again). I'd say anecdotally, 80% end up DB after about 15 years.