That's called a " Prostate Massage". I know a few males who loves it. Don't know for sure though b/c I'm not a guy...so anyone out there willing to share some insights!!!
Seriously ...
... Ok ... ( ̄へ ̄)
That's called fisting. Both men and women have anal pleasure spots, the whole hand isn't needed to locate them.
It's the first time that I had so much comment or reply to me in 4 days only and you guys give me many informations about it
Of course it's because I don't know anything about it even thought it's really rare to see that kind of situation that apear in Yaoi manga ... Because I read a lot of it so ( Yaoi manga ) ...
... I don't know if it was the last chapter so ... Anyway about the whole hand inside the butt when I saw it', I was like ... HOLY SHIT , DAMMIT or really ???!!! something like that so ... That's all !