Why do men suck vagina?

A strange question... Are you really asking why do people give oral sex? Or do you think fellatio (man getting head) is normal but you don't understand cunnilingus (woman getting head)?

Oral sex is great for many reasons. I like to give my partner oral pleasure because I love to feel and hear her reactions, I get joy and pleasure out of my partner's pleasure, I particularly like the taste, and after she has had a clit orgasm she is so juicy and hot and ready that the sex is amazing!