The `Umbrella` singer - who has been single since Chris Brown assaulted her in February - is ready to date again but isn`t interested in suitors who don`t measure up in the bedroom.

When asked what a guy needed to impress her, she quipped to German magazine Bravo: "He has to be good in bed and the size matters. You know what I mean? The inner beauty counts as well, but without a toy it doesn`t make it fun. Right now I don?t want to have a serious relationship, I want to have fun."

Although she is on the look-out for a guy, Rihanna is careful about who she gives her number to.

She said: "I love flirting at the moment. I`m single and I`m enjoying my freedom. But I don`t give my phone number out that often. But if I`m dating, I check the boy from the top to the bottom."

One guy Rihanna has her eye is `Grey`s Anatomy` actor Jesse Williams - who plays her love interest in the video for `Russian Roulette`.

The 21-year-old star revealed: "Jesse, who`s in my music video for `Russian Roulette`, is soooo hot!"
sections: Celebrities