1. 与多人发生性关系的；淫乱的；滥交的
Someone who is promiscuous has sex with many different people.

1. casual and unrestrained in sexual behavior

e.g. her easy virtue
he was told to avoid loose (or light) women
wanton behavior

Synonym: easylightloosesluttishwanton

2. not selective of a single class or person

e.g. Clinton was criticized for his promiscuous solicitation of campaign money