. . . . By your definition, gay men can never have sexual intercourse because neither of them possess a vagina and lesbians can never have sexual intercourse because neither of them possess a penis. Also "your first time" can be complicated to define if one has been a victim of incest or rape. So I firmly believe that losing ones virginity is when you voluntarily allow someone to penetrate one or both of your lower orifices for pleasure. . . . ~ Dianne
Gay/lesbian/homosexual/bisexual/heteroflexible or whatever people playing with each other's same sex bodies do not have sex/sexual intercourse. Keep in mind with my saying that, I have been with women and played with their bodies as they have played with mine. We inserted various things inside each other's bodies, licked each other in all the proper places and played with plenty of toys. That's Masturbation, not sex. Yes, we all had a wonderful time, we all liked each other very much and we would do it again, and NO it isn't sex. That is not to say they ( and I include myself here) can't have a completely satisfying, meaningful, significant relationship without having a penis inside a vagina. Giving yourself an orgasm or fondling yourself isn't sex either. A man and woman naked in bed together hugging, fondling and loving each other (like my husband and I do almost every night) are not having sex either until the penis goes in the vagina (which DOESN'T happen every night).
"Sex" by having a penis in your rectum is a lot of fun, but is no more "sex" than putting your penis inside a carved out cucumber or stuffing that cucumber inside your vagina or rectum. It's playing with your body--masturbating.
Masturbating is stimulating the genitals for the pleasure of it. The dictionary does not set restrictions on how you masturbate or stimulate yourself. Sex, on the other hand requires a penis to be in the vagina.
"Your first time" if you are raped or a victim of incest IS STILL YOUR FIRST TIME, it's just a terrible introduction. Permission or liking the other person has no bearing on how you lose your virginity. I lost my hymen when I was about 12, but that didn't mean that was when I lost my virginity because I did it with my fingers, candles and cucumbers. I lost my virginity the first time I had a penis in my vagina, not when I stuffed candles and cucumbers inside myself.
You lose your sexual virginity when you have sexual intercourse the first time. It takes a man and a woman. You can call your first time lecturing to an audience "losing your public speaking or oration virginity" or the first time planting flowers in your garden "losing your gardening virginity" and you can call having a penis in your butt the first time "losing your anal virginity", but when it comes to sex, it's the first time you have a penis in a vagina.
When it comes to definitions, and you CAN NOT make them up as you go along or change them to fit your situation. Try taking an exam and telling the teacher, "everyone is entitled to their own definition." If you try that, I don't know if you will get laughed at or thrown out of the room faster.
If you want a new definition, create a new word and see it it catches on.