Hi,
I know how to induce a lucid dream (not always, just when I have plenty of time to sleep), and I want to experience sex while it.
I'm afraid that when I'll ejaculate in the dream, I'll also ejaculate in the real life (I heard that some people had it) and it will mess and stain my underwear, and therefore my parents will see it while washing it (and maybe even the bed will be stained).
How can I experience an orgasm while lucid dreaming without ejaculating in the reality?

Thanks!