I have absolutely no interest in Ann Summers parties. I find the thought of discussing advanced lingerie and sex toys with other people appalling, male or female.
Having said that, as long as they state trans women and women, I don’t really see the issue with it.
If it was a make-up class (still unlikely that I would attend, but possible), I wouldn’t mind at all if trans women attended. They would probably be better at make-up than I am.
I just think it needs to be open. I have a friend who wears the hijab (which she only will take off at home with only women) and who does not touch males (except her husband), even to shake hands. I doubt she would attend an ann summers party, but possibly, possibly a female only make-up party. I could see her having issues if the make up artist was a trans woman. Language is important, even in non safeguarding situations.