That's minimum 10+ people a year!
Agree with Romy that most people should probably play the field a little more.
Best way to figure out what you like in your partners. Though I feel you could get a handle on that with a sample size in the double digits.
Getting raped by your cousin at the family gathering while the rest of your family eats dinner and has a good time downstairs, only vaguely remembering you when you've been missing for quite a while, but by that point the damage's already been done.
You should totally agree to be free-use for your friend group! It won't affect the dynamic except by making all of you closer and happier! They'll totally still respect you and regard you as an equal!
No chance that they start forgetting to even count you as anything but a toy~