In much of the country, the Pill was still only available to married women, but it had nonetheless become a symbol of a new, freewheeling sexuality.

And in the offices of TIME, at least one writer was none too happy about it.

The partners could be strangers, friends, casual acquaintances, ex-partners, etc.

Sex was no longer a source of consternation but a cause for celebration; its presence not what made a person morally suspect, but rather its absence.

"We have 22 community centers within the city of Albuquerque, a playground recreation program as well as a therapeutic recreation program," said Jess Martinez of CABQ Family and Community Services.

The actual overall prevalence of hooking up is likely even higher, since these estimates are limited to college students.

Post-college social interactions for individuals in their 20s or 30s present many new opportunities for hooking up, and with no sign of these trends changing, we need to evaluate how hooking up is connected to psychological health and well-being.