This may be long, apologies I advance.
My 15 year old son has recently come out as bisexual. Middle of last year he started hanging out with a new group of friends that don't go to his school, he started changing the way he dresses and was with kids we didn't know (except one of them, a girl who used to come to our house) anyway, he told us that this girl was bi, then a few others in this group were too which then made us wonder what they were all getting up hanging round the park so we tried to reign him in a bit which was all helped with the lockdown situation, fast forward to the middle of Jan and we agreed to let him out to meet up with one person for a walk, this person, was born a female but doesn't identify as a specific gender and wants to be referred to something different than their given name, he told us this when he announced he was bi. He said he was interested in a relationship with this person. We are so grateful that he can come to us and open up but now he's started searching for condoms on the Internet. This concerns us for a number of reasons, they're not actually together, they are currently meeting up to walk round a park because we are in lockdown and not visiting houses so a park is not a safe environment, I think they're both confused about who they are, they're both under age.
Does anyone have any advice on how we can approach this?