Not particularly anything different than I've already said on this thread. My only new advice is to not listen to people who don't have relationships - both PUA and long-time single individuals. Having a fulfilling partnership is different than one night stands and casual flings.
Here here. I do plenty of things I dislike for her; and she for me. Ultimately, that is what having a partnership is about.
Your objection comes from a heavy-handed response to the word "slave". To serve one another like a slave would be to do anything, regardless if it's what you want, to ensure your partner is happy. Do you think I enjoy having to constantly carry everything? Go on long walks after a hard day at work when I just want to sleep, all because she wants to feel safe outside at night? Sometimes it can be nice; but it can also be burdensome. I willingly do it for her as her needs are more important than my own to me. Some would call that serving as if a slave; but it's different, as it's a mutual dedication to each other's needs/desires.