It’s best to use protection if you’re going to get close….
(I’m noticing from the comments that some people don’t get what the protection is…Is it my drawing that makes it hard to tell it’s a condom? Should I redraw to make it more obvious? Did you get it? )
I drew the snake on the left in ink in my sketchbook, painted it with watercolor, scanned it, and then in Photoshop, added a new layer and painted in the “protection.” I placed the two images side by side in a new Photoshop file.