Snooping
There is a thing called trust. Once you lose it, you may as well end your relationship.
Sharing A Toothbrush
Sharing A Toothbrush
This is just plain gross. Sure you exchange saliva when you kiss, but you don't have old food and plaque floating around in it. Just refrain.
Talking About Your Past
Talking About Your Past
Leave the past in the past. Nothing good can come from talking about it.
Body Hair Overgrowth
Body Hair Overgrowth
Keep yourself as well groomed as you did on your first date. Ladies, you're going to bed with hairy legs and hairy pubes, you may as well put on a granny gown and sleep alone.