What is a good topic for a thesis in BS Psychology?

As someone that HAS a BS in psychology, did an Honors thesis, and is planning a Master's thesis right now, I can tell you that this is not a good question. I will explain why in a minute. But first, I think it's awesome that you're planning to do a thesis in psychology. It's a good learning experience and (if done right) is fun. So I'll explain why this isn't the right question.

Doing a thesis, as you will discover, is intensely hard work. Even an undergraduate thesis requires hours of lit search, synthesis, writing, data collecting, and stress. Because as undergrads we usually don't have the knowledge necessary to do all this work on our own, undergrads (and even graduate students!) pick a mentor to work with. So your first step in doing a thesis is to pick a mentor who is doing research that you are interested in.

Once you've selected a mentor, usually a professor in the psychology dept but perhaps in counseling, Human Development & Learning (HDAL), if those are separate departments at your school, it's time to work with that mentor to get a project idea. The reason you want to get your project idea from your mentor is that he(or she) will have expertise in the project already, so he(or she) will make it so much easier for you to do all that work. Usually your project is going to be one of two things: something the mentor is already working on, or something closely related that you and your mentor made up together.

If TL;DR, Don't choose a topic on your own--choose a mentor at your school, let him or her pick the topic with you, theses are PAINFUL but less so with a faculty friend.

Good luck!

Interesting Topics In Psychology

What type of activities enhance memory, or learning, or more fully utilize intelligence? (That's 3)

What is the long term effectiveness of cognitive therapy with the severely depressed?

What is the evidence that positive psychology is superior in results to other therapies?

Can personality be changed? If so, how much in what ways? If no, why not?

Poverty in America

Inter racial marriage

Why do people who were abused tend to be abusers?

Why do children of teen mothers, tend to be teen mothers?

Why do teen mothers tend to keep their babies, instead of adoption?

Why has marriage decreased in recent generations?

Do couples who live together before marriage have a higher success rate in marriage?

Why is violence prevalent among young people?

http://www.ivoryresearch.com/psychology-dissertati... they have a great list of ideas to get you started

If by BS you mean BullShit, then I can be of assistance.