There is a Japanese technique called Kinchaku---golden purse, named after these golden purses that were used in the olden days and that had a round opening with drawstrings that would pull it tight. It basically involves the woman tightening up her pussy with her kegels---but she does it in between the contractions of a guys cock when he cums. If you time it right, it is incredible---it feels like her pussy trying to suck out or milk your penis as you cum. My first wife, a Japanese girl, and I read about it in a Japanese book on the traditional sexual culture of old Japan. She would do it to me but could never get the timing right. My Filipina wife is more sensitive to a man's orgasms and after I told her about it, she was able to get the timing down.
Idk if this counts but I have moved it inside my gf up and down and push in all the way as I’m moving it then I spread her legs to go in deeper.
Kegals is it, squeezing that PC muscle does the trick - plus it's fun to do the up and down wiggle trick - look, no hands..... Sometimes I think we are more obsessed with our cocks that women are....we do appreciate your interest, tho....
I can do it with mine. I use the PC muscle to make it throb. My girlfriend loves it when I fuck her without moving. I can bring her to orgasm that way. She can also make her pussy contract rhythmically until I cum. I LOVE THAT!!
Stopping the blood flow for too long will mean that once all the oxygen is absorbed, the tissues will start to die. It may even decompose and drop off. LOL.
It sounds to me as if you both managed about 20% in your biology exams, but you are making up for it now. No doubt you are enjoying it much more than drawing 'cock' diagrams in the classroom.
To bad we can’t lock together like other mammal’s. Where the male penis head swells and stays that way for a period of time while cumming in the female.
One of my girlfriends experienced such powerful orgasms, her vagina would contract so strongly that I couldn't pull out until her orgasm was over. I LOVED that!
There are three movements being discussed here. There is what I call twitching where the cock is temporarily a little bit longer. Then there is where it gets wider but I have never experienced my cock getting wider except the head can definitely swell in all directions. Then there is flopping up and down; perhaps it can be compared to the movement an old-style slot machine's arm makes. I wonder if any slot (slut?) machines had an arm in the shape of a cock. I can twitch my cock out and back; it is just something I have voluntary control of. I fantasize of being able to fuck a woman in public and no one knows that I am doing it except the woman of course. It is difficult to do it for an extended period of time, if for no other reason than I get distracted. For me I get pleasure from doing it like an orgasm and I am tempted to just keep my cock in an extended position because it feels good like that. I would not call it Kegels; as I said in a different discussion, kegles are for exercising the muscles for urination. There are multiple PC muscles (plural) used for sex. There are videos of women doing that. Some for a few minutes. They are very clearly twitching some muscles. Sometimes they twitch the muscles of their clitoris and make it slide up and down. Women do have spasms during and after a climax but I think that the twitching in the videos is, although interesting to watch, not the result of the intense pleasure of an orgasm. I am not criticizing any of that, just explaining. So there are multiple types of twitching and spams that can occur for women.
I've been exercising all of my PC muscles since I was 6 - both with and without an erection. Of course, at that age, I had no idea what my PC muscles were. I just knew that if I worked "those muscles down there" just right, I could make my "special feeling" (what I called orgasms before I knew what they were) way more intense & longer-lasting than usual. I also discovered that I could also hasten or delay my orgasm by working those muscles just right. And I eventually discovered that I could reach orgasm hands-free, just by working "those muscles down there". The result is that I've always been able to control my orgasms while making love & can time it so my partner & I reach orgasm together, and I can make my penis pulsate strong enough for most of my partners to reach orgasm without thrusting or moving at all (similar to a woman working her vaginal muscles & making a guy orgasm without thrusting or moving). Also - even at 62 yrs old, my orgasms are still extremely intense & long-lasting, and I can reach orgasm 5 or more times a day.
I'm actually talking about women deliberately and willfully moving their clitorises by flexing, again, deliberately, their PC muscles, just like when we as men do the same and deliberately make our penises move with our PC muscles. I mean, unless you already understood all that, in which case, my bad, lol.
When the cock is about to ejaculate there is a muscle at the root of penis, which surrounds the bulb of the penis, contracts rhythmically to expel the semen. When this muscle contracts the blood flowing into the head of the penis tend to stagnate in the head (glans of the penis) which makes it to swell more. In a way, this makes a tight seal in the depth of the vagina and prevents the semen from leaking out so that most of it will find way into the opening of the womb. Maximum girth of the penis occurs just before ejaculation.