Dear Prudence: The “Call 311” Edition

First up, an opening statement from Prudence on the merits of 3D BC movies. Then, your letters! When is it okay to ask for exclusivity in a relationship? Can I cut down my reclusive neighbor’s dead tree? I’m trying to get back into the dating world, but last time I dated Tinder wasn’t even a thing. How do I do this? My boyfriend wants to be a “known” sperm donor for his friend, but I’m against it. I bought my son’s girlfriend a pregnancy test and her mom found out. Did I do something wrong? Hear more Prudence by joining Slate Plus: Slate.com/Prudiepod. Learn more about your ad choices. Visit megaphone.fm/adchoices