virginity in men is like sluttiness in women - it's repulsive to the other sex.
female virigns are prized and valued while male virgins are ridiculed and shunned, just like male sluts are looked up to as winners while female sluts are seen as disgusting and trashy.
why is it this way? hard to say. probably because virginity in a man is often indicative of him being a general failure and also autistic.

i obviously have no idea how any of this translates to gays or lesbians though