The rumble of a train on the tracks, the purr of a hairdryer, the rhythmic drone of a photo-copier are all enough to make her go oh oh oh, ahhhhh.
She had FIVE orgasms during our 40-minute interview. But I can't take the credit-it was just talking about her sex life that set her off.
Sarah, 24, suffers from Permanent Sexual Arousal Syndrome (PSAS), which increases blood flow to the sex organs.
She said: "Sometimes I have so much sex to try to calm myself down I get bored of it. And men I sleep with don't seem to make as much effort because I climax so easily."
As she chatted, Sarah became increasingly flustered.
"Sorry, you'll have to excuse me for a minute. I'll be with you in a sec," she mumbled before letting out a long sigh.
Sarah, from London, developed PSAS after being prescribed anti-depressants at 19.