The default tags really do need some more additions. Custom tags are nice, but I find there’s a few problems - majorly that the number of synonyms, alternative spellings and typos can damage searchability. If something is a common enough interest it really should just be a default option.
The other thing that really bothers me is custom tags being at the top of the list - it really feels like I’m trying to highlight a specific thing, when it may not even be one of my major kinks. I think this is great if you have something you really want to note there, but not when it’s a common thing that should just be a regular tag.
I, along with other, actually suggested a whole bunch of tags in an older thread: Proposal | Addition of a Maybe tag + Additional tags suggestion.