Had my first TS experience. Booked the lady based on the fact she was nice looking and that she was "fully funtional".The lady was very pretty and pleasant and I ended up having a nice time but I wanted to experience being topped for the first time. I was told she couldn't maintain an erection long enough to be a top. So what does fully functional mean?

Sounds like she has her own definition of "fully functional", or she lied about it ..

I understand "fully functional" to mean the ability to achieve an erection AND be a top to a bottom, to completion.

"Fully functional" in an ad seems to mean just a threshold ability to get it up.

Look for "top" as a codeword and for "versatile," meaning the ability to go top or bottom.

Of course, it's best if you can find a very recent (repeat, recent) review by a hobbiest you know will generally want to be topped.