Poll:Should sex be engaged in solely for reproduction?

[kerry]

Had dinner with some colleagues last comment. Somone commented on a colleague not present who is 38 and about to get married and is a virgin. He also does not masturbate. This lead to a conversation about the morality of sex and the arguments put forward against Colorado's Amendment 2 (which precluded gays from making civil rights claims based on sexual orientiation discrimination) by the philosopher John Finnis. As a Catholic natural law philosopher he claimed that the natural purpose of sex is reproduction so people ought not to engage in sex not aimed at reproduction. This precludes masturbation, pre-marital sex, gay sex and contraception.

Nobody in the room last night believed that argument. We all found it incredible. But I am wondering, are we just a statistical anomoly? Is there a significant number of people who really believe this? One colleague thought that the only people who really believed it were a small group of theologians with low hormonal levels and diminished sexual appetite.
So, I'm curious. How many of us think the only natural moral purpose of sex is reproduction?

So, the poll question is, True or False: The sole moral purpose of sex is reproduction so non-reproductive sex such as masturbation, gay sex or use of contraceptives is wrong.