What do you mean that you regret it now. It grows back so what's the harm?
As a side note...shoot your load underwater and watch it in the water..pretty amazing.
meaning it grew back all funny like and is longer than i would want and was very itchy for along time
shaved my "happy trail" when i was 10 to (yes i was 10 and had one) and i also regret it to lol because now its like all messed up heh
You just need to kinda scoop it up more with the tissue cause it doesnt absorb so well. Thats actually the sperm not mixed with the semen so its quick sticky to help it manoevre in the vagina. But yeah, try and pinch at it to pick it up rather than wipe.
It doesn't coagulate. If anything it becomes runny. Semen itself is biodegradable.
When semen is first ejaculated it is usually thick and, if you leave it for a while it becomes thin and, once thin, it is easier to wash off. When it is still thick it doesn't mix with plain water very well and is harder to wash off - it tends to stick together and resist the water and this is what the original poster was having a problem with.
Back to the original question, if you are not masturbating in the shower or are doing so before you turn the water on I would try to get as much of the cum wiped up as possible before you get it wet by using tissues, toilet paper or some kind or cloth or towel. Then use warm water and some kind or detergent like shower gel. Someone mentioned lynx - the active ingredient in that is sodium laureth sulphate (also spelt sulfate) so anything containing that will work well (probably >= 90% of the market).