Definitely don't let the subject matter trouble you. Most of us are desensitized to discussions about
bodily functions. For me, I'll talk about
bowel movements as easily as I would about
music or movies.
Since switching to a "Paleo" diet (which has no singular definition), how has your food intake changed? Making major changes to your diet will almost assuredly affect your elimination, until you get acclimated.
If you've had any digestive issues -- whether before or after switching diets -- you may simply be noticing undigested foods. If this is the case, here are some suggestions:
1. Try chewing your food more thoroughly. Chew everything until it's liquid. Do this for 24-48 hours, assuming normal bowel function, and see what happens.
2. You could also add digestive enzymes and/or digestive bitters with your meals. You could do so in conjunction with Item #1.
3. If you drink carbonated beverages, don't drink ANY of them one hour before meals, during meals, or one hour after meals. Doing so can negatively impact your stomach acid, and, in turn, cause issues with breaking-down and digesting foods. So, no beverages with bubbles.
4. Another possibility could be low stomach acid. (This could also be related to Item #3.) There are "Betaine Hydrochloride (HCL) with Pepsin" supplements to help increase the level of hydrochloric acid in the stomach, but I would NOT suggest using such supplements, unless you either have your stomach acid tested (via Heidelberg Gastrogram test) and/or you work with a knowledgeable healthcare provider that's experienced using such supplements.