Things not to do on yachts:

1) If moving, take a leak off the high side (i.e. into wind).

2) If stationary, take a leak off anywhere without a hand-hold.

Remember, water police have a neat acronym for some of the items they find in the drink: "OFS" (= "Open Flies Syndrome" = drunk, taking a leak, no hand-hold, fell in).

Mind you, I come from a generation where taking a leak off a boat was what you did. These days, in many areas, even if you survive the experience, you are likely to be hit with a hefty fine for violating the purity of the local water!