Kay so let's get some things out there. The dev for whatever reason decided, that above a certain level of points, some event won't increase them anymore. Nicole's relationship above 50 is only increased by the beach meeting, therefore you need to do it 10 times to get the final yacht scene. Also, whenever a convo comes up about taking out her to somewhere, you'll have to wait for the next day to do it, and it's an automated event. Therefore first you take her out to clubbing and dancing, above 50 something relationship, then you take her to the pool, then the yacht. It looks like, convo about taking her out, waiting for the next day, take her out actually. For the yacht thing you'll have to have a 1000 bucks. Btw the same stupid mechanics applies to Karen as well. You guys also have to take note that the masturbating together scene not increases, but decreases their lust by 10, so watch out for it, and also what gives and not gives an increase in stats anymore.