I think if you think of humans as amazing minds in monkey bodies this makes sense.
the monkey body wants fertile young people to have sex with.
in some humans the mind is thinking about whether the other person actually wants to have sex with you, considering the future, will this person actually be interesting to talk to, how will they feel afterwards etc.
I like to think that listening to what your mind (Terry Pratchett called it 'second thoughts') and your conscience are telling you is important. Men (and it is mostly men I think) who behave like Gaiman do not I suppose.