To think she should know better

[Rosebel]

My daughter is 11and has autism but is high functioning. Very recently I've become aware that she has no social filters. In particular she will use the word penis and vagina infront of anyone. My parents, MIL, family,friends. I don't think it's normal and don't know if it's her autism or if she does it for attention. I wouldn't mind her talking about it to me but she just has no social awareness. Is,that also a sign of autism? She's only been diagnosed since August so it's new to me as well as her.

In what context does she say them?

In what context is she using them?

I agree that a lack of social awareness can be a feature of ASD. But the use of correct anatomical terms in a conversation where this is appropriate is not a cause for concern, and the reaction of family and friends should be ignored. But if she is simply repeating these words out of context and for no particular reason, then that is a problem.

Does she maybe think it’s funny?

I don't think she finds it funny as she doesn't really do humour. I mean she knows the right words but will randomly start discussing how people have sex when the conversation is about something else.
My eldest didn't do this so I'm not quite sure how to react

She'll probably discuss these things in the wrong settings because shes trying to stimulate herself? In the sense that, she's bored and wants to talk about something that interests her (unfortunate topic but hey ho lol). My DD has recently started blurting out "SHIT!" just for the shocked reaction (shes 5.5) and we're trying to curb all that, but again, shes doing it when shes bored. Try discussing with her in a way you feel might work that she cannot do this. Stop her every single time she does it. Good luck!

I don't think that's highly unusual with autism. Sounds like she's got the concept that it's not appropriate to use slang words to describe sexual stuff, but not that sometimes it's not appropriate to discuss it at all.
She might never fully understand ~why~ its not appropriate, but she should be able to learn and apply rules for when it is and isn't OK to discuss certain topics. Lots of repetition on your part of 'we only discuss this in private' or 'we would only talk about this in a group of female friends' etc is probably needed.