Romantic and sex relation structure of high school students

I like the funky patterns formed in this figure from a sociology journal paper entitled “Chains of affection: The structure of adolescent romantic and sexual networks.”
One component of the network linked 288 students – more than half of those who were romantically active at the school – in one long chain.
On a side note, I also find it ironic that the man who did the study looks like a pedophile. But thats just my personal opinion.