PROBABLY we should have expected just what did happen. Perhaps we should not have been surprised when it happened, and happened with frequency. Nevertheless we were surprised. First, we were delighted with the response to our pamphlet "What to Do on a Date." The initial printing sold out before the pamphlet left the press, which seems to prove that Shakespeare wasn't too smart when he declared there is nothing in a name. Then we started to get the question which we should have set ourselves to expect: "Now," wrote in a surprising, number of young people -and some not quite so young - "now that you have told us what to do on a date, how about answering the real question: How does a person get a date?"