my friends put me in uncomfortable situations?

so i was video chatting with two of my friends. I'm a guy and they are both girls. we were playing like truth or dare and stuff. they kept asking this one question obviously trying to see if i masturbate. when they already know i do. we went through it a long time ago. and they were like what its it what is it? kept asking over and over again. and i kept saying nothing. hoping they would get the point. its getting really annoying. its like they are trying to put me in a situation i obviously don't want to be in. and i don't think friends should do that. i know i should have just told them to stop. i don't speak up when I'm really pissed off like that.

also. would you be surprised if they masturbated too. because i wouldnt. it seems all they talk or joke about is sexual things. it really annoys me.