This really isn't a new development, Larian has been advertising the fact that they are going to have fully animated sex scenes for a long time (and they are somehow even more awkward than I thought they would be), the Minthara scene is just the first one they put in that wasn't covered by a big "under development" splash screen.
It's also unfortunately on-brand for Larian, as in DOS2, you could have sudden meaningless sex with someone at least twice, in addition to the late-game sex scene with the companion that you had built a relationship with. These were mostly text based, with characters in posed tableaux sequences, rather than fully animated scenes.
I wish they would put in a "no intimate scenes" option for those who want it.
