Depending on what kind of person you are, you will either feel, see, smell, or something else. Some of these will cause you to feel lustful feelings. They can apear as a full form, shade, red orb (or another color), or something to please your mind. Er, it doesn't really matter on the phase of the moon, it just makes activity stronger. If you come to know these creatures closely, the will sometimes become jealous when you leave them for another lover. If you're not that experienced, sometimes you will feel strange pains in random places or sometimes you will think nothing will happen. Don't do something that you can't handle though, it is like inviting a stranger into your home then throwing salt in their eyes to get them to leave. This is from my own experiences, there might be more things that can happen, but as I said, it depends on the person.