Although The Power of Truth is not a harem game and has routes, the MC is not committed to any girl unless he wants to. He has an issue with commitment due to an event in his past. This commitment will only take place late in the game. Until then, he will be free to fool around with any girl in the game he desires. Some girls won't have any issue having a sexual/romantic relationship with him when another girl is in the mix (threesomes), and some girls will want to be exclusive with him.
There is no NTR, and no femdom is planned at the moment, no insect. Lesbians will sure be there. Fetishes will be avoidable.