i don’t know - i’m only speaking from my 2 latest experiences. The first guy, whilst mutal respect, and a certain attentiveness had already been inspired pre-phero use -a combo of nols and edge gel, and basically arousing the hell out of him, is what got him wanting to cuddle and always be around me, and act boyfriend-like. But the boyfriend like part was more like the folks you see draped all over each other at the park.
With my more long-term guy it’s apparently the TAL.
I wouldn’t say the TAL inspires arousal in him so much - well i guess it does, but not so much raw sexuality, as mind-blowing OMG you are my DREAMGIRL!!, arousal.
In both my cases - obviously it’s arousal, combined with previous feelings (both these guys had crushes on me when they were young, like early 20s - but it was the untouchable, unattainable kind of crush), that turned things up a notch - so i can’t speak for more long-term truly committed situations.