The only significant difference is that a larger proportion of today’s young adults are celibate (then 10%, now 15%). Otherwise, things are pretty much the same. The term "hook-up" may be new, but as far as getting it on is concerned, bed-hopping appears almost identical. Today’s twenty-somethings are doing what today’s 45-year-olds did 20 years ago, and, as far as this 66-year-old can recall, what today’s retirees did 40 years ago.