My brothers friend was staying at our house for the past few weeks until recently. Anyway the two were really good friends with this girl, not friendly sexually, but friends.
She would come over to our house and the first couple times she just walked in as my parents were out of town.
Anyway, she ended up adding me on "facebook" so I said we met when she randomly walked into my house and I was sitting at the computer naked.
Needless to say, two days later she ended up coming over and I was prepared. I took off all my clothes and sat at my computer playing guitar to cover up my genitalia. I made sure to face the direction of the entrance of the living room so as soon as she walked in she saw me sitting on my computer chair naked playing guitar.
It was hilarious and I am pretty sure it turned her on quite a bit. 