There are two types of NTR...
If you are having your woman taken away from a position of weakness, then that's being a cuck.
If you are sharing her from a position of authority, then that is different altogether.
It's all about who is being humiliated, you, or the girl.
If it's the girl, then you're not a cuck. You're just letting your friends borrow your stuff.
I actually had this happen with my first girlfriend at age 12, she had short hair and wore basketball clothes. Found out when I went to use "His" bathroom. Knocked on the door and that's when I found out she was a tomboy. She held my dick while I peed and you can guess the rest, ah memories.
If you are having your woman taken away from a position of weakness, then that's being a cuck.
If you are sharing her from a position of authority, then that is different altogether.
It's all about who is being humiliated, you, or the girl.
If it's the girl, then you're not a cuck. You're just letting your friends borrow your stuff.
Lots of MMF / Orgy, if you're not into that this one might be a rough ride.