I can't speak for everyone, but at the beginning of my relationship with my husband he could literally breathe on me and I would melt. We've been together 15 years, even now most days if he bites my neck I will actually collapse from it. No resistance. And yeah, he's the same, my mister gets an erection if i hug him too long even now. In the beginning, he would randomly get one just from looking at me. I've only had one serious relationship though, and never reacted like that to anyone else, so maybe it's about affection or something? That's all I've got.
I see!! That is beautiful!!! I'm setting your relationship as my future goal!!!
It might be really easy to get hard, but to cum dat easily as the yaoi manga shows isn't very realistic. Also a guy cumming only from being fucked in the ass is nearly impossible according to my knowledge, you atleast need some handjob, even if it's a little bit. I'm saying this based on all the real life gay porns I've seen so far. But it might be different for individual.
Am with my girl friend if I do much and lick the back of her neck she gets wet
Yes, it's easily to get boner when a person who is attractive to you hug or kiss you.
...but I noticed that characters in Yaoi manga seems to get hard or boner or whatever you may call it easily. I was like do people really can get aroused that easily or I just simply lack something. Its a harmless question btw. Not insinuating or referring to anything.
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And to Potato-san. You've work hard. We appreciate your work very much!!