Hi @Franny ,
That sounds like a really tricky situation for you, and I really empathise a lot with you there - would this be your son's first serious romantic relationship?
It sounds like this could be a good opportunity to have a conversation with him around sexting and consent - it's something that's a common concern for parents of teens, and we have some really good resources here on this issue on our website. The article I've linked to has some really good, clear information on boundaries, and some of the risks of sexting that he may not be aware of ( for example, if she is sending him explicit pictures of herself and she's under 18 that is actually illegal)- and though it's definitely an awkward conversation to have, it does sound like you have a good relationship with your son, which is a great foundation to start from.
With forbidding him to see her - that is a really hard one. I can definitely see your point, I suspect that if you completely ban him from seeing her, he may just end up going behind your back. What do you think about having an open chat with him about how you're feeling, and maybe seeing if she wants to come to your place for dinner sometime if all goes well with them? It can definitely be really hard to see our kids making decisions that we think may end badly, but ultimately he will need to learn to make those judgments himself, and if he knows that he can be honest with you about what's happening for him, it may make him more likely to open up about any problems that do crop up. That being said, I think it's also very much ok to set boundaries around what acceptable behaviour looks like for your family - we do have an article here that I thought might be helpful about talking to your teenager about healthy boundaries in romantic relationships.
I'm also going to tag some of our active parent champions here too so you can get some more people's input - keep us posted on how you get on, and thanks for joining us on the forums 
