I usually just say "don't worry about it." My husband knows, and figures it out for himself. Other people don't have a right or need to know, and you don't owe them any explanation. You can make jokes about making love with a porcupine or something or say "I fell" or "I got cut" or whatever. But you don't have to tell them anything if you don't want to.

<font color=orange>"If a light beckons to you, follow it. If it leads you into the quagmire, you'll probably find your way out of it again; but if you don't follow it, you'll be plagued for the rest of your life by the thought that perhaps it was your star." Friedrich Hebbet</font color=orange>