"A Popular Resort" joke

Last summer a friend of ours vacationed at a popular resort where he met a young and charming girl. She prided herself on being a good sport and demonstrated this by enjoying just about everything with our friend-dining, dancing, swimming, tennis, horseback riding, motoring-just about everything, in short, except that special enjoyment he was really interested in.
"Oh, come on," he entreated, "you're always saying what a good sport you are- Why draw the line at this?" Appealing to her sense of good sportsmanship finally turned the trick, and the last evening of their vacation was the most enjoyable of all.
Back on the job, our friend had almost forgotten the incident when, just a week ago, the phone rang.
"Do you know who this is?" a sweet, feminine voice asked.
He didn't, of course. "The girl from the lake this summer," she said. "The good sport."
She said she had something important to tell him and wanted to meet him for a drink after work. Remembering the pleasant interlude at the end of their vacation, he made a date for that very evening.
Over Manhattans, the girl confided that she was in a family way and asked him what he was going to do about it.
Our friend was understandably unnerved.
"I-I don't know what I can do," he said, gulping down his drink, "This summer was just for laughs. I'm engaged to be married to another girl. The question is, what are you going to do about it?"
"Well," she said, almost in tears, "I suppose I could kill myself!"
"Gee!" He breathed a sigh of relief. "You are a good sport!"