a man gets up by lust can last only a few minutes.
a man gets up by affection and intimacy can last for hours.
This is my conclusion.

when i watching porn and fucking my onahole i only lasts less then 20 min.

when i looking at a woman's eyes in some portait(not even in a sundress or bikini) and fantasizing the romantic interactions with her, the sense of erection is completely different. and i can fuck my onahole for 2 hours. minimum 1 hour. you don't even need to cum because it feels almost like a meditation.

Erection in former case i feel the gland isn't erected properly and feel i'm only stimulated the outer part of myself.
in latter case i feel the whole dick is excellently elected and i feel my spine, all parts of my brain are also stimulated well.

However this is why i'm still touching my cock instead of getting a gf or wife and pumping her with this energy.

I feel fucking fantastic after romantically delusionally raped the woman in my fantasy for hours. But also feel ashamed for myself because i spent a shit load of time over masturbating.