I did similar things together with my husband very early in our life together and can only say: "go for it, have fun!" - there is nothing better for a marriage than this, and I'm totally serious with it
Too many husbands keep back with such wishes and are finally just frustrated because they cannot live their sexual dreams! Be happy that he tells you what he imagines to be sooo cool. This is a perfect attitude for living a happy marriage together
By the way: it can well be that he finds out that it's not sooo cool, when the situation actually arises... lol, but that shouldn't have too much impact on you! A man who has such wishes has to experience them to be able to judge what he's really able to stand and what not
I personally just would choose a guy I would find nice...
my 2 cents
hugs, Judith