Why do men lose erections after they ejaculate?

Okay, so I keep hearing that for every 30 lbs a guy loses (actually I've heard other versions where it's 10 lbs, which just strengthens my opinion on the subject) his penis gets an inch longer. To me, this freaking REEKS of BS, but I have friends who believe it or aren't sure. I've looked everywhere and can't find solid information one way or the other. Experts seem to agree that the ONLY thing that can increase penis size is time, which would run contrary to this story. Can you confirm or deny this?

I'm 17,and I have been dating this guy for like a year. We just started having sex, and the other day we were going to but he wanted me to give him head before so he would last longer...then he could not get it back up. He tried hard to but it just wouldn't. Was it me? Can I just not do it for him or something?

My boy friend is 15, has never had an erection and every time we want to have sex we can't. He thought it might be a medical problem but he asked the doctor and said no medical problem here. We have tried everything. The first thing we tried was dry humping and nothing happened and then I tried grinding him they say that can be very arousing but it didn't work. I let him look at porn and nothing happened. More suggestions?

I've read that the head of men's penises are very sensitive, or the vein on the underside. But my boyfriend doesn't seem to be affected by it too much. In fact if it wasn't for the fact that he thrusts into my mouth when I go down on him, I would think he was completely unaffected. Could it be my technique or is he just really unresponsive or maybe even a little hardened by sex after indulging (with the same girl) in the past?

I'm 21 years old I've been sexually active since I can remember, and never was interested in getting or giving a blowjob. But now, I want to but don't know how to give oral sex in a way I know he will ejaculate. So I just open my mouth and then what?

I'm 15 years old and my penis is at least be 8 inches when I get to my full length. Right now, without being erected my penis length seems to be about 4 inches. Is that normal? When I look down at my penis, it seems to look smaller than what girls tell me after we have sex. However, is there anyway to make my penis bigger without using any pills, oils, or some type of machine?

Okay, here's my dilemma. I am 16 and sexually active. I've been with my girlfriend for a year and a half. We've used to have sex perfectly with no problems until about a couple of months ago. Now, I can't even get an erection and I don't ever feel horny anymore at all. I ask all my friends if they have this problem but they say no, they can get erections very quickly. I'm having a lot of trouble with this because I thought at this age teens are able to get it up quick and easy. I don't know if it's a testosterone problem or not but it's starting to wear on me. I'm in good shape, but I smoke a little bit. Basically, I've completely lost my sexual appetite. This isn't right. Someone help!

So, I just had sex for the first time last night and I guess my foreskin went back and it kinda hurt. Is it normal that my foreskin should go back like that? Also, I never had an orgasm last night and I woke up this morning and my foreskin was still pulled back. Is THAT normal?

-Confused

When does pre-cum come out of a guy's penis? Does it come out when he gets an erection or does it come out when he is actually having sex? Does it depend on the guy?

I am a 16 year old male, weighing in at 212lbs. I am losing weight at a decent rate, which I have heard helps your penis size. I have seen post contradicting the last statement, however from my own research; losing weight helps to increase blood flow to the penis, which in turn helps your penis "grow". On to the subject, I have what I could consider an unusually small penis. At 5 inches in length and 4 inches in girth I am not sure what size condom to get. I have been looking, for a while now, only to find nothing. To make finding the right condom harder, my girlfriend is allergic to latex. I am nervous enough about my penis size (the smallest she has had is 8 inches), but finding the right condom makes me more nervous. Thank you.

What is erection?

Hello my new partner is Wonderful. He is everything I've wanted in a man. There is just one problem, the sex isn't great. He has a small penis and he is overweight. I am 135 and he is 250. I don't want this to be a problem and I know he is working on eating healthier and trying little to loose the weight. I am very scared to get intimate because I feel like he is either embarrassed or I might unconsciously make dissapointing gestures. In sex, who likes to be unsatisfied time after time. Can you give me helpful tips on love making?