We're always penetrating your mom
Mom : typing ... *gets married* *have kids* *gets old* *dies* *goes to hell* Mom: Fish, honey!
Your dad doesn't watch when I ride my bike.
Because they make up an awful lot of stuff. EDIT: Because I forgot about neutrinos.
We are both constantly penetrating your mum.
When you are a type of radiation. No one wants someone who can't penetrate well.
Step one: penetrate the student body.