If they happened (which is unlikely considering how professional and monitored the ISS is), it would have not been in a way that can conceive a child
The problem being that every action has an equal and opposite reaction makes certain activities more likely to result in new force vectors which in turn results in velocity that may lead to bumping into things you'd rather not bump while trying to bump uglies.
Like if you wiggle your arms you won't start to swim through space so as long as your bodies are wiggling then you also shouldn't start to swim? As long as you kick your shoes after before not during it seems to me that there shouldn't be an issue.
Do they still use Skype up there?