Really no this is completely false so sorry to burst your bubble.  I have already corrected you on this erroneous belief about women elsewhere on this thread however.

Most women have sex with men because they are physically attracted to them and they hope the guy has a decent personality too.  Many women are in horrible relationships with men only because they like having sex with those men and they are conveniently around.  I have found this is true with male friends of mine sometimes too.  They stay with women they don't like and don't want to ever marry out of lust and convenience alone.