If you were friends with a couple, and you knew the girl was going to sabotage the birth control so she would get pregnant, would you tell the boyfriend?

This issue was buried in the other question
http://www.fluther.com/168647/nsfw-could-she-get-pregnant-this-way/. I didn’t really follow the answers, but I think it’s an interesting issue that may be overlooked as it’s buried in the question about “can she get pregnant this way?”

If you were friends with a couple and were aware that the girl was going to poke a hole in the condom in order to get pregnant, would you tell the guy?