Ok so I was a shower head girl LOL !!!
The thing was that my older sis would tease me after I showered & orgasmed because I used up all the hot water.
If my sis figured it out I was afraid that my mom had figured it out too so I switched to humping the corner of my mattress at the foot of my twin size bed.
(Sometimes with a Sharpie marker sticking in my butt)
LOL
GOOD LUCK !!!