promiscuous

Concise Oxford English Dictionary © 2008 Oxford University Press:
promiscuous /prəˈmɪskjʊəs/

▶adjective

• 1 having or characterized by many transient sexual relationships.

• 2 indiscriminate or unselective.

– derivatives
promiscuity /prɒmɪˈskjuːɪti/ noun,
promiscuously adverb,
promiscuousness noun.

– origin C17: from L. promiscuus ‘indiscriminate’ (based on miscere ‘to mix’) + -ous.