Who am I?

[LONDONER]

On Monday morning the Postman is walking through the neighborhood on his usual route, delivering the mail. As he approaches one of the homes he noticed that both cars were still in the driveway. His wonder was cut short by Derek, the homeowner, coming out with a load of empty beer and spirit bottles for the recycling bin.

'Wow Derek, looks like you guys had one hell of a party last night,' the Postman comments.

Derek, in obvious pain, replies 'Actually we had it Saturday night. This is the first I have felt like moving since 4:00 am Sunday morning. We had about fifteen couples from around the neighbourhood over for some weekend fun and It got a bit wild. We all got so drunk around midnight that we started playing WHO AM I.'

The Postman thinks a moment and says, 'How do you play WHO AM I?'

'Well, all the guys go in the bedroom and we come out one at a time with a sheet covering us, with only our 'family jewels' showing through a hole in the sheet.. Then the women try to guess who it is.'

The Postman laughs and says, 'Sounds like fun. I'm sorry I missed that.'

'Probably a good thing you did,' Derek responded. 'Your name came up seven times...