what causes you to pass blood from your penis?
487109
A kidney infection, go see your doctor, its important.
651370
The part responsible for this is a long mass inside the penis, it looks rather like a sponge, with lots of space inside. These little caves can fill with blood and as a result, the penis thickens, grows in length and all the rest of it.
735962
It happens when you press the blood vessels and the blood supply is cut off momentarily. Better keep your hands free and do not put pressure on them by putting it under your head or keeping them hard pressed between your thights etc. More suggestions only if you can tell which way you sleep. \n\nIf it persists, consult a physician
314272
it constricts your veins..therefore causing you to have less bloodflow to your brain.......
453538
I'm going to assume you mean impotence, no?\n\nLots of things can cause it.  Too much drinking, stress, prescription drugs, and there are many physical ailments.  \n\nCheck out Yahoo health for some ideas.\n\nhttp://health.yahoo.com/search;_ylt=AtLjUi9Tk7WyEn987FwMDSqz5xcB?p=impotence
956194
Have you had sex with anyone that you are unsure of. that could be one thing, but usually when you have T.O.M (time of the month) that can happen, you are loosing a lot of blood at once. if you have never had this before I would check in with your doc. give her a call and see if it is OK, if not you could always go in and have it checked.
192322
Hey i know that one. My Friend had friend that had the samething on his penis.Its genital herpie, he needs to see a doctor .umm only way you can get that if it bleeds and the blood gets on you.
425333
The penis is made from a spongy tissue. When a male gets sexually excited, this tissue gets filled with blood and the penis hardens as a result.
1162560
Its probably infected.  You need to be cricumsized before you loose more than your foreskin.
420875
Theres blood in your urine. Go see a doctor soon!
93214
Sounds like what you are descibing is spotting.  Definitely call your doctor though.  It could be as simple as rough sex that caused the bleeding, or it could be a sign of an STD, or an infection down there.
640618
I had that problem. I went and got it checked out and found out that their was blood vessels outside of my cervix and sex would break the blood vessels easily.  I just had them dried up in surgery and it went away. Go and have a check up. :)
869607
I regret I'm not having that problem.   I would if I was in that situation stimulate more blood to the penile area by taking Damiana, Ginseng, Yohimbee bark and Vitamin E.\n\n/doc
1170796
I would suggest a website such as Wikipedia for more information, as there are many causes and "cures" for it.\n\nIn brief, impotence is either physical or psychological. The way a penis becomes erect is a rush of blood to the organ, which then causes the penis to become rigid to aid during intercourse. Impotence is the condition when this blood does not stay in the penis for long enough, or the inability for any blood to get to the penis in the first place.\n\nPhysical\nIf the impotence is caused by a physical problem, then the cause can be disease or infection, a blockage of the veins, or some other restriction. The cure would be to provide medication or surgery to help the symptoms reverse.\n\nPsychological\nSometimes the problem is caused through the brain. Maybe the man does not feel up to it, is tired, or feels insecure. These and other similar reasons can impact on his ability to "perform". The way to cure this is to help the man through his emotional problems and allow him to feel safe and secure again.
321051
Usually when very comfertable of a night time, the body tends to move alot, this moving can rub the penis and make it erect. Heat also does this, i mean your under the covers for around 6-8 hours a night, it gets quite warm down there. However, the main cause is urine, it is warm, and stored, it heats the blood near the penis and allows more to flow, causing a hug erection, going pee pee will mostly fix it, its just part of going through puberty
1107382
it doesn't normally get a lot of blood (unless it's hard).  same reason your hands/feet get cold.
304746
Well the erection comes with the filling of your penis with blood and... it dones not has to deal with your vitamins.