((As to why though OP, I genuinely don’t know. It just hits a certain spot but I’m not sure why.))
Biceps bouncing when a woman is simply doing something, so female, like fixing her, or brushing it, hits a real hot spot for me. Oh, I love a strong, confident, clench-fisted flex too but when her biceps are popping, without really flexing, that is HOT!
I've noticed it's a very common request on HBC. Earlier FBB videos feature it heavily. I like it a lot. What's the appeal? I have a theory but I want to see what other people say first.
Seems to me like a quad shake or certain abs flexes or pec/breast flexing, it just will not happen without biceps that are built way up and with added control that comes from a ton of practice in flexing. It's as if the nerves that activate the muscle need to be hyper-developed, too. A true muscle control issue. And, so exciting to watch because the expansion of the muscle brings it to a size all out of proportion to what you see in its resting state.
There is just something about the muscle being able to move on it's own without using the rest of the arm that is incredibly sexy. You witness the immediate expansion from the resting state. It's also such a complete show off move, a girl has to be really confident in her muscles to bounce her biceps for an extended period of time. And finally the rhythmic contraction of a big peaked bouncing bicep always struck me as sexual, like mimicking the rhythm of sex.
I have a theory that it's like the girl is jerking off the viewer with her bicep. Or that the bicep itself is the dick. Maybe too Freudian, I know, but there could be something to it. For example when Alina Popa puts her lips on her bicep while bouncing it.
A post I read by a GwM user about getting a "bicep job" from Julie Bourassa back in the day. That's what got me wondering about it. Bc a FBB rubbing a dick with a giant bicep (17 inches?) might actually be what we're imagining while we're watching her bicep bouncing.
I think it's just a form of teasing for bicep lovers. Simple as that. The amount of the actual bicep muscle belly that is bouncing is important. When a woman with a small frame and a mountain of bicep muscle can bounce it right ...OMG. I'm owned.
It's not nearly as hot when it's just more of a flex/unflex motion than if the muscle belly is also obviously loosening up and jiggling/swaying from the bouncing movement. More bounce in the ounce ....
I've noticed it's a very common request on HBC. Earlier FBB videos feature it heavily. I like it a lot. What's the appeal? I have a theory but I want to see what other people say first.