PROMISCUITY
promiscuity, promiscuousness, sleeping around
(noun) indulging in promiscuous (casual and indiscriminate) sexual relations
Source: WordNet® 3.1
Etymology
Noun
promiscuity (plural promiscuities)
The state or quality of being promiscuous.
Indiscriminateness in the choice of sexual partners.
(dated, literary) State of being mixed, composed of diverse elements, unsystematic; heterogeneity.
Source: Wiktionary
Pro`mis*cu"i*ty, n.
Definition: Promiscuousness; confusion. H. Spencer.
Source: Webster’s Unabridged Dictionary 1913 Edition