One NO NO is try to avoid having one of your shooting ropes to reach her hair. There seems to be a big taboo of even a bit of semen in the hair.
This is because it’s a pain in the ass to wash out, but if you time it when she’s planning to was her hair she might not mind as much.
It's because you have to wash it with cold water. Hot water will basically cook semen and make it much harder to wash out.