I didn't see an option that looks like it.
Maybe you need a certain amount of them for it to appear? If not, then it might be a bug in the game or it might require a certain version to have it be avaible, which version are you using? The Itch.io or the Patreon? the latter might have that added in all ready, but the former might not have it yet.
Version 0.15.1, which is the Patreon version, is needed for giving him and the other lizards the lust potion to have their lust meter go up, so unless you want to support him to get that version, you will have to wait until Hayo release that version on Itch.io next month i think, it was usually ever day 25 or so each month, but he is doing them near the end of each month instead.