Scarcity Oneitis - Basically a loneliness FOMO type oneitis where you are more obsessed with having sex or something than actually pleasing the person. This usually happens with beginner-intermediate level guys, but it can sneak up on you during a vulnerable time in your life. You will forget about this girl like a McDouble meal after a night of drinking.
That Girl Oneitis - You feel really bad when you are not with this girl. Deep down, you know that this girl could command you to bark and you would happily do so. When you are not with this girl, you are obsessed with the fact that she is with another guy while you really don't care much about the scarcity oneitis. If you can relate to the song Mr. Brightside then you are on this type of oneitis. Every guy has a certain type of woman that is his kryptonite, so this can happen to anyone. These women have the potential to ruin your life and will always be superior to you mentally, so I wouldn't recommend going further with these women. My weakness for some reason is semi-nerdy, insecure closet, cute, skinny, perky, flat chested white women