I have a friend that's gay and I went threw his internet history without him knowing and I found armpit fetish stuff. I didn't ask why cause I thought it would make thing more awkward, but Why do gay people like armpits? It's like saying why do some people have a foot fetish? I don't think anybody really knows the ins and outs about why.
Groom this, wash that and oh by the way, make sure it all smells good after lathering up. It means his system is working correctly and purging toxins from his body. Just thinking about it now works me up.