For many who go off to college, it is a time of independence and worrying about you, yourself, your future, and your well being, while, of course, keeping family at home in mind. However, there are those really annoying roommates that feel like everything everyone does is their business and needs to go through them. If you are that annoying roommate who feels the need to control everyone else's life, please stop. What others do in their room, private bathroom, and spare time should be none of your business.
Yes, you do share a common area, however, besides a living room and kitchen, they paid for their own bedroom, and in most cases own bathroom as well. So in that case, who they choose to hang out with or have a sleepover in their room and bathroom should be none of your concern. Do not ever force someone or require someone to follow your lifestyle or preferences.
They are just trying to live their lives, just as you are. It's not our job to act like parents and tell college-aged roommates how to live.
If you choose not to have guy friends over, great, don't have them in your room, but that should only apply to your room – not everyone else's. If you choose to not have your boyfriend over during the day or at night, great, then don't do that but don't ruin your roommate's romance because you cant get over yourself.
College should be an experiential and enjoyable time, not a time where you need to stress about if your uptight roommate is going to spazz out about you having guests over or living your life. Feeling like you're living with strangers in your own home and walking on eggshells can ruin the college experience.
The bottom line is: College is already stressful, so please just be cool and not stress about other peoples' lives. Everyone is entitled to live their own lifestyle and follow what their hearts desire brings them to, so please just respect each other by understanding that everyone is allowed to live as they want in their own space. It's okay for people to live a different lifestyle from you – the point of being an adult is to learn how to get along with others and respect personal choices while being understanding.
It's also okay to set some rules, just not ridiculous rules. Having someone take the trash out on a certain day or having no-noise hours during finals week is one thing, but you shouldn't be a tyrant when it comes to a living space you share with other people.
So just learn to have fun and understand that your roommates have the right to being who they want to be, and you just have to do you.