I started when I was 14 sucking cock and getting fucked (with condoms back then - dear god what *was* I thinking?!) with guys who were in their 20s and 30s. I loved it. No regrets at all. As soon as I realised I was gay, virginity was a thing I had no use for, and made sure that it got fucked ragged clean out of me. I saw it as a call to adventure, not something to shy away from.
By the time I was 18 I knew I was more sexually experienced than any of my friends - who all seemed completely naive to me, despite their boasts - but I didn;t come out til I was 19, so I never spoke a word.
So perhaps I'm biased, but I see nothing wrong with it at all. That said, for me 18 is a very strict age limit, which is perhaps hypocritical but there it is.