I'm from central/eastern Europe, and I feel a little bit of WEIRD bias [https://en.m.wikipedia.org/wiki/Psychology#WEIRD_bias] in many opinions presented here.
I'm not saying it's wrong. I'm just finding myself more and more blocked when it comes to discussing such topics.
Your friends have friends of different sex - I get it, but for how long we would have to debate here to check if there really is no sexual tension there. Where does relationships come from then in those groups? None of those friends become pairs/partners? There are no ex-lovers who after 10-20 years are coming back together from the "friendship phase". Etc.
On the other hand, I never said that there is only sexual tension. Just that it's hard for me to imagine a world where it's not important.