I'll be interested to see if the comic actually SAYS, "No, they DIDN'T have sex," or if it simply says, "We made out," without ruling out that they also had sex, in order to keep it intentionally vague enough to preserve their "all ages" rating.
If it's the latter, then by that standard, we can't even say that Peter and Michelle had sex after the wedding, because technically, the word "sex" hadn't even APPEARED in conjunction with that event, on the printed page itself, and besides, Peter woke up in his boxers, and yet, Steve Wacker said, "What you think happened is pretty much happened," so it'll seem odd if Van Lente tries to impose a different standard of Proper Audience Interpretation onto those two scenes of maybe-sex involving Michelle.