I have Aquarius in the 8th. So..... Uranus return?
Maybe Saturn square. For the timing of life events, I'm inclined to look at the traditional ruler first, when there is both a traditional and a modern ruler. I believe you're around Saturn square age now? Everyone gets one at age 36-37.
About 1 out of every 12 people has their eighth house cusp in Aquarius, and most of them lose their virginity sometime before the age of 84. In a case like that, I would look to see if the timing coincides with one of the hard angle Saturn transits to its natal position, which happen every 7 plus a fraction years.