Sup, i think they're available when you unlock sunflower city, basically every time you buy a burger or a soda that sum piles up so when it reaches 400 one of 5 of the delivery girls comes in and offers you a quick one. That's their first animation, you can get the second if you waste another 400 cash on top before the timer they've come together with hasn't ran out. Here's a link for a better explanation: https://lustful-spirit-hunt.fandom.com/wiki/Animations
