I see this on a constant basis, females, good, vagina good, penis, bad, filthy, gross. There's almost this sense that male sexuality and orifices are inherently evil.

Nowhere is this more obvious then our perception of homosexual males (even if it's accepted now is seen as most deviant, nobody want to see it). Lesbians are cool because of vagina, bi women are cool because vagina/penis (which is seen as a natural evil almost but necessary), maybe women "aren't even attracted to penis", and normal straight men are normal because vagina.

Anything that isn't entirely focused on the vagina and femaleness (with a male on the side out of necessity at best as is the case with heterosexual women), let alone male homosexuality or entirely focused on maleness, is seen as almost wicked historically.

This is how people think.

Where is this rooted in, religion, culture, biology even?