I actually have the opposite problem lol. I was playing a good character so Gale and Wyll approved all my actions. I had "exceptional" approval with them and they were the only ones who turned me down. Situation with Wyll was especially funny, because he said "I just don't feel the connection" and then he slept with Laethel. Yeah, you don't feel connection with a person who did all your quests and was acting heroic but you feel connection with the evil githyanki. Alright.
And I actually think it's great that sex finally is not an ultimate goal of the relationship in the game. I'm really interested to see how relationship will develop later on. Plus it really suits Astarion and Laethel and I heard you don't actually sleep with Shadowheart. Not sure about Wyll and Gale because well I've never got that scene with them.