promiscuousness vs promiscuity

promiscuousness and promiscuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
promiscuousness	Yes	No	No	No
promiscuity	Yes	No	No	No

As nouns, promiscuousness and promiscuity are synonyms defined as:

promiscuousness and promiscuity: indulging in promiscuous (casual and indiscriminate) sexual relations

Other synonyms of promiscuousness include sleeping around.

promiscuousness (noun)	promiscuity (noun)
indulging in promiscuous (casual and indiscriminate) sexual relations	indulging in promiscuous (casual and indiscriminate) sexual relations