Every family has secrets. ASSUMING his parents can leave the past in the past, I’d leave it alone. If you feel you guys are getting super serious (marriage), maybe ask his mom WHY she feels like he needs to know.

Does he know about your participation in the lifestyle in general? Has he participated in the lifestyle? Something you’ve discussed doing together? My point is, the GENERAL idea that you were (or are) participating in the lifestyle is the pertinent thing to share. And NOT because of skeletons in your closet … rather because it’s who you are (or were). Outside of that, I see no need to kiss and tell. I don’t. And I don’t expect my wife to, no matter who she was with. All that matters to me is that we’re in alignment now.

Best of luck to you.