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Specifically, you and Yvette need to be in the gym and you need to ask her to do pull-ups.
Seriously, the second best advice is to search this thread. The best advice is to save early and often. That provides you with restore points to load again and again. Now try different things! Change your actions, change your or her stats, answer differently, change wardrobe, take a pill. Now after you have exhausted all options search the thread, still can't figure it out? Now ask your question, but have the courtesy to provide details of everything you have tried.