Yes, I am still a virgin and as a teenager, sex is a mentally unstable 'craving' that keeps messing up my lucidity. Nearly every lucid I had ended with me attempting in sexual activity. My last dream, I stopped myself, but even the thought of it spawned a DC before my eyes and suddenly woke me up. (I am not sure whether it 'wakes' me or I just continue with a non-lucid)
I believed it was due to my expectation of having sex resulting in something 'amazing' to happen; in these cases, it's wake up time
So what can I do about this? Surface the desire in waking life? (Doubt this will happen ) - also, majority of these lucids ended up as wet dreams.