I'm 15 and I took my sister to the pool yesterday. She went right to the pool jets and said "Hey, Rachel, you should come here and try this. It's really fun!" And she proceeds to put her clitoris right by the pool jet. Then she says, "I saved you the good jet. That one's better." And I wanted to see if she knew what she was doing and she said "You put your pee pee by the water and it feels really good. If you do it for long enough you get a funny feeling." Is she masturbating with a pool jet? She's only 7. Do you think she understands what's she's doing?