If you are noticed by a female, try your best to ignore her presence until you're dressed again. Use them only if absolutely no other option is available. In the woods, far from civilization, restrooms typically aren't available. Get behind sufficient growth so that you are completely invisible to the remainder of your party before you begin. Check carefully that you aren't near any sort of animal or insect den.
Ants are especially bad.
If you forgot toilet paper, bring a leaf identifying guide. Poison oak makes a poor substitute. If you stand too close to someone, they will think that you are gay. If you stand too far away from someone, they will think that you think that they are gay. Three shakes only.