free love 
noun [mass noun]
The idea or practice of having sexual relations according to choice, without being restricted by marriage or long-term relationships.We practice safe sex, not free love, but not chastity either....
- Abstinence was most noticeably absent in the 1960s, when the oral contraceptive pill brought about a sexual revolution and free love for all.
- Dressed in an elegant suit and displaying a formal, almost aloof, bearing, he seems far removed from the days of free love and gay liberation.