Why is that so scary for men to spend a whole night sleeping with someone they've sh***ged?

I agree that its a maturity issue.

Many young men are insecure, and don't want to stick around because they believe you will get too attahed to them.

BUT... you never know, some young guy, if they really like you, may stick around anyway.

Really, the best thing to do is to be very comfortable with the person you sleep with, and hopefully they would be caring enough to stay afterwards.

Good luck, use protection, and have fun.

I think you're talking about boys, not men.

Which is your answer in a nutshell. When you're old enough, try sleeping with men instead.