Is it possible to sleep with a guy? just sleep with him ? and not have sex?

Yes marriage

Anything is possible.

Hahaha yah its called marriage! LOL! Just playing. On a serious note.... Of course it is possible but you are putting yourself in a situation where sex is very likely to happen. It is better to sleep separately till you are certain that is something you would be wanting to do.

Sure.

There could be multiple reasons why this wouldn't lead to intercourse.

Anything is possible. It depends on the guy also. If he knows beforehand that you don't want it to go any farther, and he respects your decision it's possible.

Yes of course it is possible sex isn't the only thing a good guy cares about

Yes.

I had occasion to do so a number of times in my 30's.

Most adults are capable of acting like adults when appropriate or necessary.

Casual sexual encounters are not always satisfying---certain basic attractions (beyond atavism) must be in play.  

Morality aside, if those are not there---abstinence is the best choice.