The reason I thought for once but didn't consider periods as the reason is because in the scene at 19:32, something like blood was shown flowing down in zig-zag(forgot the correct term) way, but the source of the blood wasn't a sexual organ of course (as I interpreted the scene) . More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.