I can't think of anything that is less important, but I will address it. Probably after one or two too many drinks, my wife and I discussed when she lost her virginity. Was it when she had quick, really quick sexual intercourse when she was quite young? Did our mutual masturbation qualify when we dated? Or was it when she had really good sex the first time with a date in college (not me)? Our answer--who cares?
My wife says it's when a penetrative sex act occurs, whether it's fingers, penis or tongue that does the penetrating. I asked her, "What about straight guys? When do they lose theirs?" She said when someone else makes them climax (I.e. Not masturbation). I don't know if I agree with her, but it's one perspective.
