Historically incest has been involved with more than the Antebellum South. Europe's royal lines were so rife with it from the Habsburgs having bucketfuls of daughters they traded to every bloody noble or royal line with a loose son. Similar instances were in play for the Middle East, Africa, South America, China, and India. Hell, some people in India practice polyandry, or one wife for multiple brothers, and sometimes that wife is a sister or cousin.
Rape though is abhorrent in all cultures, even in the histories when asshole military leaders and kings called it "the Soldiers Pay", Prima Nochta (a lord's right to rape a bride on her wedding night), and to "bring the Light" to women whom didn't conform to traditions. Maviarab is correct in his historical and cultural pronouncements my friends.
All that aside, L&P is the dev. He has decided to add lesbian content, as a side path to what clearly is a hetero game with some incest via Dylan, but also includes May/December romances with Zac, Sam, and maybe others. He has chosen to not go all the way for any sexual path yet, not just rape fetishists. He also, as the dev, has a right to do as he damn well pleases to as the dev. Like it or not for all of us. That includes us whom are lesbian lovers, incestaholics, harem whores, or flat out hetero sluts.
If that bit bothers you, then say your damn peace and bloody well walk away. Arguments to the contrary only leads to moderator raids that lock us all out from saying our peace.
Wishing it otherwise won't hurry the game's progress, or get any of us the proverbial, "money shot".