Don't remember but the basic massage rate is like 500-600 TL (it's usually sign posted and offered as part of the "full package" along with the scrub, entrance fee and such - around 1400 TL or so). Fyi, these rates are at least 50% of what you'd get in a regular, non-gay hammam (and the premium ones are definitely much more) - quality varies.
(E.g. The treatment I got from Firuzagha was quite good and thorough.)
Extras: basically fucking. Or you suck them. I guess the standard assumption is that they only do "top stuff", nothing "gay" like kissing, etc. You can try and negotiate and it's probably a case-by-case answer. It's funny how their whole logic may work but, hey, to each, their own.
Another update: I checked out Yesildirek at roughly the time of peak attendance. I only stayed for 5mins and didn't even get to take my clothes off.
The place was super local, service seemed meh and the clientele was definitely on the older side, and again super local. It felt weird so I just bolted. Given that it's also off the main area, I'd say the effort to walk all the way out there wasn't worth it.