When I've got a girl alone maybe in a seduction location and we end up on the topic of sex (as you do

)
I always drop in the line.
ME "Oh We can't shag by the way

"
and it goes like this:
HB "Why not"
ME "Cus i don't have any jonny's"
........
then the girl acts like she doesn't mind (sort of qualifying herself to me

)
Later on thery find out that I do in fact have 1
I'm not sure why this has worked every time but after they kinda seem to pretend not to worry about it and seem really relaxed. Is it comfort building?
is a type of "push-pull" thing?