I'm in trouble with my wife

Our oldest son just got married. He's 21 and left for his Honey moon a few days ago. My wife asked me did I have the talk with him and I go "What talk?" She apparently told me a few months ago to have a "talk" with him. My son is a virgin(I mean I'm assuming not anymore) but before he and his wife got married he was a virgin. So was she and they were doing the waiting to marriage thing. Not for religious reasons. Her reasoning is because she only wanted to be with the love of her life and my sons reasoning was simply I told him he wouldn't make it to marriage (reverse psychology. Don't come for me. That's how our relationship is). Anyway my son got the sex talk when he was like 12 and another one when he was 15 and he got caught watching porn. Apparently my wife expected me to have a more indebt sex talk with him? She apparently did with his fiancé and told his fiancé to get on antibiotics before they have sex because she is more prone to infections because she's a virgin. Idk if that is true or not but I don't see why I would be giving my 21 year old another sex talk. He knows the basics and I'm sure they'll figure it out. No offence to my wife but I'm sure that's not a conversion his wife wanted with her mother in law. Our son doesn't need mommy and daddy to walk him through sex. But she's for real still mad at me and won't talk to me so I'm not really sure what to do. I honestly forgot she even asked me to give him another sex talk.

I already had the marriage talk with both of them when they were in premarital counseling. The ups, downs, respecting each other. All that stuff.