The Sportsman’s Double

I met an older woman at a bar last night. She looked pretty good for a 60-year-old. In fact, she wasn’t too bad at all, and I found myself thinking she probably had a really hot daughter.
We drank a couple of beers, and she asked if I’d ever had a Sportsman’s Double?
‘What’s that? I asked.
‘It’s a mother and daughter threesome,’ she said.
As my mind began to embrace the idea, and I wondered what her daughter might look like, I said, ‘No, I haven’t.’
We drank a bit more, then she said with a wink, ‘tonight’s your lucky night’.
We went back to her place. We walked in. She put on the hall light and shouted upstairs: ‘Mom, you still awake?’