Pre-cum is a clear, odorless liquid that comes out of a mans penis when he is aroused. It can come out any time from when he first gets aroused and an erection or later. Contrary to what alot of people say, pre-cum itself does NOT contain sperm and can not get you pregnant. The only way sperm comes out with a mans pre-cum is if he has previously ejaculated and hasnt urinated since then, since some sperm could remain in his urethra and come out mixed with the guys pre-cum.
Mandyloo has covered the main question Allie but in regards to your boyfriend heading straight to the bathroom afterwards and taking a while - he most certainly trying to pee. The thing is though, after you ejaculate you always seem to need a pee but because you still have an erection it's really hard to do so and it always takes a while to manage it. So don't worry about what he's doing in there.
Do you think that's why my boyfriend always goes to the bathroom and tries to calm down and pee after he comes? Well. That's at least what I think he's doing. He just goes to the bathroom and is usually there for a lil' while. Is there anything else he could be doing?
The cowper's gland produces a clear fluid to neutralize the acid in the penis (from urine so the sperm are not killed as they pass through) and acts as a lubricant when the man is aroused. They covered the rest of it...
Before having an orgasm and ejaculation, a sexually excited (even before actual sex begins) man "leaks" pre-cum. This pre-cum is more clear and thinner than what comes out during ejaculation.
Thank you!! :)