My game has mostly had the asks come in the form of BFF requests, from teens my teen sim both knows and doesn't, and none have been friendly enough for my Sim to initiate the BFF ask themself. If I say no, it destroys the relationship, so I have to say yes, especially if they're not actually friends yet.
And like someone else here, teens have been entering my Sim's home without knocking. Send Home is present, but Ask to Leave is not. If I catch them before they ask, I can use Send Home to make them leave and they go without asking to advance the relationship and the existing relationship is not damaged. The world my sim is in is Willow Creek and the most recent Sim that walked in was Gemma Charm from RoM. She and my sim were not friends before she asked, but they had met.
I haven't had problems with the parents being asked yet, nor has my sim been asked by anyone they have not met. However, to complete aspirations, I've had my sim introducing themself to anyone and everyone first.
My sim did get one prom and one going steady request, but that was from an existing love interest I engineered. Their promposal was ruined by their love interest asking them to prom first, and then the next day asking to be their girlfriend, but I had wanted my sim to ask her to go steady at prom. Only that one sim has approached them with romantic requests so far.
