Wow, besides couples looking to "add a third" to their relationship-- "share" a gf, the next most common issues on the boards here has been men OK with their wife/gf seeing other women, but not other men!
And besides his one penis policy (OPP), your bf's transphobia makes me sick.
I applaud you exploring poly at your age. My daughter also did in her early 20s but is taking a break and has been mono with her gf for a couple years. Even though one may be attracted to multiple people, successful poly hinges on knowing oneself well, having firm limits, discussing and establishing healthy boudanries... this can be hard when one is only 20something and barely knows oneself yet! Keep up the good work, and good luck! Keep reading around the board here, read websites, read books.
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
me: Mags, 58, living with:
miss pixi, 37, who is dating (NRE):