The bug with the condom will be fixed in next fix update, thank you for reporting it. You are not dumb, it is just not explained explicit (Teachers just tell you to attend the classes regular in the morning) the classes work simply: visit any one of four rooms on the top floor in the morning and lesson will appear. Each room has 5-6 different lessons which progresses when you attend them repeatedly. And we will add more later. Have a good day.
Viewing post in World of Sex (v0.43 - Wendy's story) comments
I will move the money from the park to accessible place, thank you. Well the trick is that you can use two fingers quickly changing and take turns to click , or maybe if space key works you could press it using the same technic. But at the moment it is just a challenge, we have a plan to put more skills into the game and make them usefull but at the moment there is quite limited usage for the strength. (we don't want to overuse them like some games do)