The phrase "sexual favors" refers to doing something of a sexual nature for someone else, usually in exchange for something else they want. Full definition
They are willing to offer money and expensive gifts in exchange for sexual favors. (adatingnest.com)
The sugar daddy gets the benefit of companionship, a sense of having helped someone, and may or may not receive sexual favors from the sugar baby. (sugardaddyuk.org)
The woman who is described with a list of titles to be easy with sexual favors is limitless. (cougarsmeet.com)