A definite turn on if he lets me watch! I love to watch my lover as he strokes his cock, love to watch it grow in his strong hands as he brings himself to an orgasm. Sometimes I just have to join the fun and touch myself as well which just creates this cycle of lust and desire as I get more turned on watching him, he gets hotter watching me, and so on...
Definite turn on I stare intently encouraging him on ... well at least I did with the last B/F the current is a no go won't even touch himself unless its standing in front of the toilet or showering sheesh.
I love watching...preferably when I'm on my back and he's about to cum all over me....
" I don't know the question, but sex is definitely the answer"
Woody Allen
I would never tell my partner that he couldn't masturbate just because he was with me. Why? Because I'd never allow some guy to tell me I couldn't masturbate while I was with him.
Mutual masturbation would be a real turn on, though, to be honest. And I would totally get off on watching a partner jerk off if he'd let me.
So yeah, I'm all for it.