The only pertinent questions you need to ask about exes are:
1. How long ago were you together? Hopefully, they didn't just split -- making you the oft-doomed rebound woman. If the ex wasn't an ex until yesterday, well, that changes things. Then you have to ask yourself if you really want to be with a guy who cheated on his girlfriend to be with you.
2. What caused the relationship to end? If he says, "She was crazy," grab your sneakers and run -- don't walk -- away from him. You don't need some scorned ex around to make you nervous.
5. Do men like it when women tell them what they (women) want in bed?
That would depend on what you're requesting. If you ask a man if he wouldn't mind lasting longer or smelling better, you'll get a less-than-positive response. But, in general, there is no better turn-on for us than completely ringing your bell (aka satisfying you sexually). So if you know a shortcut or a surefire method, then by all means, speak up. We're all ears!
If you're shy about speaking in specifics or are worried about offending him, rather than sit him down for an uncomfortable heart-to-heart, why not introduce some new and improved moves yourself, then see how he reacts? Then later on, you can ask him what he thought. He may blush; he may even balk, but it will serve as the green light for him to get creative too.