I think you misunderstood.
This isn’t about faking orgasms — never do that.
It’s about allowing yourself to get into the mood. It’s exactly like going to a movie. Maybe you wanted to go to bed early, but you agree to go to a movie, and as soon as you start watching it, you start enjoying it and are glad you went.
If you’re not in the mood but your partner is, start kissing and I can’t see why that wouldn’t get you into the mood pretty quickly (unless you’re ill etc). You’re going to get turned on if your partner is doing the right things, unless, as I said, you’re sick or something like that. Give yourself a few minutes to get into it. I don’t think I’ve ever said no to any partner unless I was sick, and after the first bit of messing around, I’ve always enjoyed it. If I offered you a gourmet cupcake and you said “nah, I’m not in the mood for chocolate” and I said “are you sure? Want just one bite?” I’m pretty sure you’d decide to finish the whole thing and would enjoy it.