Crotch smell

You know that odour that starts coming from your crotch after ~4-5 days of not showering? It smells like a mix of sweat, semen and saliva. The thing is, I really love this smell. It's almost intoxicating. I've found that at day 7 or 8 the smell has matured to its peak and you can just spread your legs and take a nice whiff and feel the goodness.

What I'm wondering is if there is a scientific explanation for my love of this smell.

Perhaps the reason is that is not quite the discernable smell that attracts you, it's the feromones that you produce and that stay down there for some time...
It is also a fact that humans choose their partners based on smell too, the immune system is somehow connected to that "background odor" we leave in our wake... Try sniffing your gf's hair after a nap together on a hot day (if she'll let you)... I'm pretty sure you'll love it.