Head during period?

So ladies here it is, my SO loves to give me head, which is amazing for me because I love it and it's the only way I've managed to orgasm. Well he'll even do it while I'm on my period! At first I was too self conscious to let him try, I then saw a similar post on here where a girl was asking if anybody else's SO enjoyed this (there was a specific name for it but I can't remember) which made me realize I wasn't alone so I tried it and it's been some of the best orgasms I've ever had! So here's my question, how many of your SO enjoy this? & why do you think they do? honestly tonight was the very first night my SO did it and usually he'll stay on my clit but for some reason tonight was different and after we were done he had a slight smell in his lips, sorry TMI but it turned me on so much because he just loved it! so what's the tea girls?