As for the anal, you are absolutely right. That is not self-lubricating. I see it differently with the vaginal: I know girls who quickly become very wet and others who do not become wet even when they are very aroused. That is biologically conditioned.
If I don't get wet, my partner isn't worth being with...though that's never happened with another woman.
Anal's a different story. Men think our asses are only tight pussies. NEWS: Vaginas are self lubricating, brought on by desire. Anal is nice with the right partner (female) and lots of lube. It is NOT SELF LUBRICATING!!!!