For sex, "yuri" is just females, "yaoi" is just males. Futanari are considered their own gender here, so sex with them is one of the following: "futa_with_female" "futa_with_male" or "futa_with_futa"
Outside of just sex, you can search for "female_only" "male_only" or "futa_only". Like Nightington said, you can also search by who is the dom (the person hypnotising) or who is the sub (the hypnotised person). The options there are: malesub, maledom, femsub, femdom, futasub, and futadom. You can mix search tags however you want. If you don't want to see a tag, put a minus sign before it in your search, like this: "femdom -malesub".
If you have any other questions, feel free to ask! We moved sites a few months ago, so not all of our newcomer help/information is still working/up to date.