While I very much like this game overall and have even supported it on Patreon for a while, taking nearly a year for some bug fixes and a single sex scene is honestly just subpar.. Especially when you consider that according to Proxxie, the game is now "a bit more than halfway done" (directly quoted from a message he posted on his discord yesterday).
Taking into consideration what's already in the game, and the frequency of updates in the past, I think it's safe to say the game will be completed somewhere in the next 10-15 years if Proxxie keeps this pace up.
As for the amount of sexual content in the game, I think I remember Proxxie saying porn was never the main focus of TPE but my memory is a bit fuzzy on that one so don't quote me on it. Regardless, the sexy stuff is obviously what draws most players towards the game, so it's not surprising people start to lose interest when so little of it gets added. The fact that some people play this game for 2+ hours without seeing anything remotely sexual is..... not great.
Wanting to write a fun story is perfectly fine, but when other aspects of the game suffer because of it, it hurts the balance of the overall experience.
With all that said, "there won't be any new content until 10.3, but 10.3 won't have an H-scene" (again directly quoted from a message he posted a couple of days ago). It sounds like it will be purely story-focused, so if you've been waiting for more sexy times, I'm afraid you'll have to wait a bit more..