Who has a penis?

Conversation with my son as he peed in the toilet:

"That's my penis."
"It sure is."
"Daddy have a penis?"
"That's right, Daddy has a penis."
"Mommy have a penis?"
"No, I don't have a penis. I'm a girl. Girl's don't have penises."
"Zia not have a penis."
"That's right. Jadzia doesn't have a penis."
"Frogs have a penis?"
"If it's a boy frog, I guess so."
"Spiders have a penis?"
"That I'm not so sure about. Bugs are very different than us. I'll have to look it up for you."
"I will have a candy?"
"Wash your hands first."

In case anyone's interested, the answer is no, spiders do not have penises. When they urinate, it's a solid (because their bodies can't afford to lose too much water) and it comes out the same hole as their poop. When they mate, their man juice comes out of a modified mouthpart (so I guess they only have oral). Male frogs do have a penis-like organ, but it's inside the body. I'm not sure if they pee out of it though.