Again Kitten gives good insite (damnit, I wanted to be first answering this one!)
TALK TALK TALK and not in bed. You two need to know this is JUST FUN and not serious. Sex is different from making love. ask anyone who has really done the latter!!
And remember to have rules. You two have to get that down BEFORE the play starts. Have a
stop word that if one of you two say it, all play stops. We do and have used it before. Actually it was me that used it. Hubby would fuck anything that would stay still long enough!

and that is not a bad thing, but I digress.
I am not a size 2, 6 or even a 10 by any stretch but I am getting healthier thanks. But its not about that. I am now very comfortable in my skin. Can you say COUGAR!?
Take it slow. if you are not ready, tell him. If he loves you and is thinking of you FIRST, he will wait. you both have to be ready.
Good luck and let us know what happens.
Salliann