To earn in the Sex2Earn game Kiss&Kitties, you need to have your own Kitties; the more you have, the more you earn. Send them to work regularly and receive your $KISS tokens. If you want to increase your earnings, be sure to acquire your own personal Dogs, too, and your revenue will increase by up to 50%. In the future, to boost your yields even more, you'll be able to purchase a personal Happy House, which will also spike your earnings by up to 60% additionally.
Further still, you have the opportunity to receive passive income from SEX between your chars. Since Kitties obtained as a result of SEX, even if sold to other players, will bring you a lifetime passive income of 2 to 8%.
And, of course, you can always trade your Kitties, Dogs, and Happy Houses on the secondary market.