1. The act of performing "raincoated"
intercourse in front of a crowd of people, to
demonstrate/promote the practice of safe sex.
2. Noisy/widespread denouncement of latex-based birth control in favor of abstinence or rhythm-based copulation. In this case, the term is often uttered in a sarcastic/disgusted tone, where the speaker feels that the outspoken actor is behaving hypocritically, since he himself either does not actually practice celibacy/safe sex, or he does other obnoxious/abrasive/
irresponsible actions in his own life that cause others far more burden/emotional pain/distress than would be produced by young lovers' having sex while wearing protection.