The phrase "receptive females" refers to women who are open and willing to listen, understand, or accept new ideas, experiences, or suggestions. They are receptive and responsive in their behavior. Full definition
When another mouse, either a male or a sexually receptive female, entered the cage, the resident male mouse usually attacked the former but mated with the latter. (scientificamerican.com)
In addition, he's always on the lookout for receptive females and, if there is a female in heat within many miles, he'll find her. (adlaz.org)
Researchers speculate that human evolution offered men who could more readily identify sexually receptive females through visual cues a better chance of having sex and passing on their genetic code. (datingadvice.com)