just, let your kid be a kid, you don’t need to talk about anyone’s genitals or bodies with them, only theirs, and only if they want to talk to you about something.
I am sure that you will acknowledge their are many parenting styles in the world. Letting ‘kids be kids’ when it comes to sleepovers in a double bed with romantically involved 14 year olds has not featured in any credible responsible parenting text I have read.
And to repeat the contradiction from your first paragraph, if OP cannot use the words girl/woman/female and boy/man/male generically with her child because that is transphobic, and mention of genitals when appropriate is also transphobic, you are basically leaving parents no way to communicate with their child that is not transphobic.
Because, one way to have completely diffused this conversation that OP had was to state ‘no, because x is a boy/young man/male. Of course, he cannot sleep in the same bed.’ But to do that, is indeed pointing out the OP child’s sex in relation to their boyfriend.
So that leaves discussion of body parts.
You’re right. Teens of that age don’t want to hear about genitals, but this is where this language leaves us.
And you may have noticed later on the OP also talks about answering questions about sleepovers with other transboys. Well, for clear communication of the boundaries being set, it does seem that the choice of pointing out the boyfriend’s relevant body part was pertinent.
And as for leaving discussions with ‘kids’ about their genitals and other people’s genitals until they want to discuss them, again that doesn’t seem to be a responsible or proactive parenting decision. You have not convinced me that it is a good decision for keeping your child safe and healthy.