Re: but ew, cooties!
I didn't really go into the "birds and bees" thing, but my point there was that, after their own experiences, Richards and Banner, at the very least, might take Peter aside and sort of mention that, given their own... difficulties in this area, he might want to double-check that he's not giving MJ (or whomever he might be going out with, depending on the point in continuity) the spider-cooties.