>>3455440It's called oral fixation.
You use circular dish plates, smoke circular cigarettes, drink from circular glasses, use curved silverware and so on, because the brain is very strongly wired to put yourself circular stuff in your mouth since baby times when it was a matter of life and death.
So I'd guess a girl that unwittingly wired her brain to want circular cilinders on her mouth all the time would find stuffing her mouth with cocks very soothing in the same way you feel when eat a hot dog or something alike.