Your decision on where to spend money is entirely your of course, so this is not meant as a criticism, but this is what can always happen in any project you get before its finished, be it kickstarter, patreon, pre-release buying or similar. Depending on the setup, specifically with projects like this, you might not be able to support the devs "after the deed is done". (Here it will probably be possible since you can buy it on Steam, but that depends on your location, erotic content is blocked in some areas.)