She's a certified gooner! It takes a special talent to get aroused by a warm seat.
It reminds me of the 1972 artwork by Vito Acconci, 
Seedbed. Visitors walked into the gallery to find a slightly sloped floor and a speaker, from which came erotic phrases. Unknown to them, Vito himself was underneath the floor listening to the footsteps of people walking on the floor, constructing fantasies about the person above the footsteps, and masturbating. Next to a microphone hooked up to the speaker.
Aside from the "wtf: level maximum" I think it takes a special gooner to get aroused by footsteps. Or a warm seat. It's so awkward you gotta laugh.