I live overseas in a compound with lots of other teachers. I have 3 dc, ds15 & dds aged 12 & 9.
Now my Ds is universally known as What A Lovely Young Man That Crowboy Is. He's a gentle giant. Funny, kind, great with little kids. He's absolutely the go to babysitter in our compound.
My dds both have local bffs. If sleepovers are allowed at all, they are definitely away fixtures; I'm the owner of a teenage boy, & naicely brought up young ladies here categorically do not sleepover in houses with unrelated teenage lads.
So, fair enough, I get it. I'm guilty of casting my suspicious eye at dd1's mate's divorced dad tbh - I have no reason whatsoever to worry about him, beyond that he's a bloke, but I do relax that bit more when dd1 BFF is inviting dd1 to stay at her mum's.
& more still when dd2 is with her best friend - both parents are colleagues so I know them well.
Who is being irrational?
Statistically, me, for thinking that my dds are fine on sleepovers where I know the dads well. That's no reason to assume all will be well.Them, for being aware that there's a hormonal teenage adolescent male in the mix? Well, obviously my boy is entirely trustworthy & delightful - in my eyes.
We do mistrust males where females are vulnerable, & for good reason, & all the Not My Nigel or indeed Now Nigella doesn't change the risks.
One thing I do know, is that a male identified as female presence in their dds' residential trips would be 100% game over for my daughters' friends' families.
& that would be a wholly rational decision, & the end of these girls' participation.
YANBU OP.