The feeling that something may go wrong for the girl you are trying to sleep with if she refuses
Note - nothing will happen to her it's just she doesn't know so she has to say yes
1. Suggested but not directly expressed, unspoken or covertly said
2. In mathematics (of a function): an expression in which the dependent variable and the one or more independent variables are not separated on opposite sides of an equation
i.e. relation expressed partly itself through itself
He didn'tshout, he didn't threaten, but it was seems on implicit warning by him.