This is generally me. However, so far, to my knowledge, there's been no "one or another" here, so I feel comfortable moving forward with everyone under the knowledge that it means I'm not missing out on anyone else. I didn't pick Samantha in the earlier stages of the game, but I think after that I picked up everyone when the opportunity arose, and will continue to do so. If that changes, and there comes a time when I have to actually pick between girls, then I'll have to start making some decisions...