But crucially, it also enables one person to contact another within a 10 metre radius without knowing their phone number.
But he wants to marry a virgin eventually: "The girls I have sex with are different from the girls I would marry - these girls want to play around," he says.
Choosing a wife But not all are like this - far from it.
"I sent some notes, they liked them - they took my number and they called me.
I say nice things - I'm into poems." While to many like Ahmed, Bluetooth is just a way to start a conversation, for some it can go much further.
At Dubai Men's College I meet several bright, studious young men.
Most want to wait until they are established in careers and in their late twenties before marrying.
"In some areas you can't talk to a girl except through Bluetooth." His flirtations by phone and other means sometimes end in sex.
Even with national girls, it is possible to keep it secret: "Hotels, flats, houses, anything - there's always a way," he says.
As part of a series on young people in the Middle East, the BBC News website discovers how technology is aiding the secret liaisons of young men and women in the conservative culture of the United Arab Emirates.
It happens in malls, cinemas and cafes - in Dubai's notorious traffic jams, and now by mobile phone.
Many of the city's black-shrouded UAE girls say they cannot check out the latest fashions in Zara or sip a smoothie in a cafe without being bombarded with the phone numbers of hopeful admirers.