My daughter is 25 and IDs as poly. She had a poly relationship with her first lover. Altho she didn't take other lovers for a few years, her gf did.
About 4 years into their relationship, she had a couple other gfs. But then she broke up with her primary, found another one, and decided to quit being actively poly and focus on the 2 of them, because she felt she didn't know herself well enough, and the young people she was seeing didn't know themselves well either. So the relationships were stormy and full of petty arguments and jealousies and whatnot.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
Mags (poly, F, 61) loving miss pixi (poly, F, 39) since January 2009, living together since 2013
"Master," (mono, 36), miss pixi's Dom for 3 years