Why do gay men want to have babies? Anon.
Are you asking if gay men want to have children or if they want to get pregnant? As far as the latter is concerned, gay men are men -- they can't get pregnant and have no desire to.
If you've been hearing in the news about pregnant men, these are not gay men but Trans Men, female-to-male transsexuals who were born biologically female, get a partial sex-change, but retain their female sexual organs, including ovaries. Therefore they are still able to get pregnant like women. Ironically, Thomas Beatie, a pregnant Trans Man who has recently been getting a lot of publicity, happens to be heterosexual, and has a wife.
Repeat: Gay Men are men who have no desire to get pregnant and couldn't do so even if they wanted to, which they don't.
Some gay men want to have children, either in the usual biological way or via adoption etc. the same reason other people want to have children, presumably the joy it brings to raise and teach a little person how to get along in the world or to exercise a paternal/maternal need.
There is some controversy in the gay community on this issue. Some gay couples see raising children as something that makes them seem more "normal," while other gays feel that those who feel that way are trying too hard to be conventional and "straight-acting." Still other gays feel that having/raising children is simply every person's inalienable right.
In truth, the desire to have and raise children is a very personal decision, often having little to do with sexual orientation. Many heterosexual couples have no children, and no desire for same.