Dating more than 1 man at a time, ok, or not ok?

It's fine to date both of them, just be honest about your intentions. Make sure they know you are not looking for a relationship right now and you are dating someone else too. Until they bring it up or you feel comfortable to bring it up yourself, though, you can just keep doing what you are doing. It's not until two people agree to an exclusive relationship anyway that it is necessary to stop seeing anyone else.