What gets your cock to its fullest erection?

Fucking another man's wife while he records it.

That's a big fantasy among straight men.

Apart from chunky lesbian porn (which is pretty much #1), seeing a big, long flaccid dick..
 
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skinny Asian girls with tiny tits and the right amount of pussy of hair.
 
You know the one, when your cock feels like it’s pumped full of high pressure fluid. And you’re working your way inside that pussy that’s tighter than a fishes arse.

For me it’s that gentle and unpredictable flick on the cockhead; or the tip of the tongue teasing the frenulum.

And last but not least, scratching and biting if the nipples!
When I’ve got a massive throbbing cock at my lips, that makes me my most solid. Or when I’m being fucked just right and the top is doing his thing perfectly, that when I get my hardest
 
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I think also just being relaxed works wonders. I’m finding some of my fullest erections where my cock feels like it just came out of a penis pump occur when I am completely relaxed with my sex partner.