partner's anal spasms

patrick670: Hey- I was wondering how many guys having anal
sex with other guys have felt their partner cum with
very hard spasms of his anal ring when he came
with you inside. It seems to vary from my experience.
I once had a BF that whose ass spasmed like a vice
about 20 times around my dick if he came with me fucking him. Yet, with some their anus just tightened
up and stayed that way as they shot. Sometimes the
best part of the whole thing is feeling his anus pulse
as he cums.

yeah, i have felt this...
makes me cum...i think that is the feeling
often described as having someones ass
"milk" your dick

rtyuii: as a straight guy that is not too knoweldgeable about gay sex, is it possible for the guy who is being entered to cum also?
does that happen from pressure on the prostate alone without any friction on the penis?

You betcha ;D
for some guys...for me it is a combination
of both the pressure on the prostate,
and a bit of handwork on my dick.

tott666: I think it's fairly rare to cum without any penis work; it doesn't take a lot though.

brad2002: This is one of the great surprises of anal sex. You can't possibly know how much pleasure there is for both partners in this until you experience it for yourself.

Antler: You can get an idea of the pleasure involved by jerking off with a dildo inside you ... that's basically the same thing (although I've never had a guy inside me).