Tumblr is a great site for quickly sharing a lot of photos. In my opinion, everyone should have both a “sterile” tumblr blog, and a “naughty” tumblr blog. Just be careful not to mix them up!
Here is my naughty Tumblr blog where I post and re-blog from others when I come across interesting cum and piss photos. Tumblr also allows viewers to submit content, so if you want to contribute some photos for me to consider, this is one option.
Here is my naughty Tumblr page of “Likes” that shows everything I’ve ever liked across the Tumblr network. This encompasses a broader set of photos than just cum and piss related stuff.