Is it normal for a guy to ask his girlfriend for play?

All humans are curious and I'm sure there are a lot of people who have indulged in 'out of the orinary things'...it is worrying for you...I would feel the same and it's good you confronted him. He could very well have gay or bi tendancies or he could just be curious and find it exciting..however if you make him feel like he's perverted or wrong he won't admit anything.... alot of men like coz it tighter but that doesn't mean they are interested in men. Tell him it bothers you ...sit down and have a proper talk to him, tell him you need him to be honest with you in order for your relationship to continue.