Tiktok Sexual innuendo

Someone help me understand what I am missing.

I am watching tiktok and this girl posts “how old were you when you discovered these”

1. A giant teddy bear

-My brain thinks “to cuddle?”

2. A shower head

-Now I am thinking “Okay so she means masterbation”

3. A corner of a wooden seat

-No fucking idea here. I am lost. Why would she post the corner of a wooden seat?!

Are all these sexual references? I am so confused