What is this feeling do you think?

[TadCurious]

I can't say for sure. It sounds like you're describing 2 different kinds of arousal. The first seems more primal and involves mental images of guys' genitals. You feel that arousal in your own genitals. And that's interesting because so many girls on this site say that male genitals are unappealing to them. What you didn't mention is if you start to get wet imagining those penises. That would be interesting to know.
The other kind of arousal sounds more based in feelings of romantic affection. For me, just thinking about my girlfriend fondly in a completely nonsexual way can give me an erection. So maybe something similar is going on with you if your body is showing other signs of being sexually aroused.

[ThomasTKay]

You sound very healthy and normal. You are wired well if seeing male parts get you turned on, especially if he is aroused. I'm similar, I get turned on obviously seeing female parts but It's 1000x more of a turn on if I can see that she is aroused with wetness, swollen clit, glistening red or pink insides, her being all warm or hot in the inside, erect nipples, etc.

As far as the stomach goes, it's most likely the thrill or rush one gets when feeling loved, wanted, successful, etc. It's a rush of energy and dopamine in the brain that makes your body feel rushed and excited in a more non sexual way.

[1stranger]

Hiimmmm 🤔🤔 This may be ulcer or gastritis or psychological..

[zaxx4fun]

When I have thoughts of a beautiful womans pussy or what it would feel like shovindg my cock in her I get a tingling sensation in my lower loins that I damn near cum on myself

[NoOneEver]

The word is "Passion"

[Anonymous]

One is arrousal and one is butterflies