Well, the boy is ecstatic, but he has never had sex before, so he makes a trip to the pharmacy to get some condoms. The pharmacist helps the boy for about an hour. He tells the boy everything there is to know about condoms & sex.
At the register, the pharmacist asks the boy how many he'd like to buy, a 3-pack, 10-pack or family pack. The boy insisted on the family size pack - telling the pharmacist he thinks he will be rather busy, it being his 1st time & all.
That night the boy shows up at the girl's parents' house & meets his girlfriend at the door. "Oh, I am so excited for you to meet my parents, come on in!" The boy goes inside & is taken to the dinner table where the girl's parents are seated.
The boy quickly offers to say grace & bows his head. A minute passes & the boy is still in deep prayer, with his head down. 10 minutes pass, & still no movement from the boy.
Finally, after 20 minutes with his head down, the girlfriend leans over & whispers to her boyfriend, "I had no idea you were this religious."
The boy turns and whispers back, "I had no idea your father was a pharmacist."