This can be caused by a burst vein in the urethra (from too much pressure) or a prostate problem. If the blood is red and fresh looking then it's probably a vein. If it's really dark or if it's a...
Group O can only receive O type blood. O - negative can be donated to almost anyone, with almost any blood group. It is concidered 'The Universal Donor'.
No blood vessel should ooze blood.However, if a cut occurs, a capillary would ooze blood while a vein would release more, and an artery would shoot blood.