Why do people feel the liberty to ask personal questions about my sexual life when I "come out" or let them know my sexual orientation?

They may be curious because they did not think that, that was your orientaion. They wish to know more about you or if there is more they don't know about you.

In personal experience, when I came out to my parents they kept asking about my sexual life like something has change. Something did change I came out and finally became myself. Somehow, my parents and friends thought changed completely as a person. Before I came out, I was really anti social, not many friends and my sexual life was nothing. After I came out, my family though my sex life was there business but really it wasn't.

That's a great question. Sexual topics are tricky for most people and we're often not taught how to broach them. So, people tend to keep quiet. When you begin a conversation about sexuality, people will sometimes forget the normal limits and rules of conversation because the feel nervous and confused about the topic of sexuality all together. With these people, it's important to have patience and remember that they are learning, too. Politely make your boundaries known and don't let anyone push you into telling more than you feel comfortable sharing.

because all human have freedom to ask questions... moreover its part of their personality, and it means also they want a connection (good or bad) with u true that questions. It fulfills their curiosity desires...that's how humanity is :) but we are also have the freedom to stay quiet about it right?

People are fascinated and confused by people who are different. When they meet someone is different, they would like to know how they live their life. Some of their questions are, of course, very intrusive and personal. My recommendation for these situations is to politely decline to disclose.

Although people's questions can be rude and uncomfortable, the "liberty" they feel often stems from curiosity. People want to know, and don't know that the questions they are asking are inappropriate. This isn't always the case; but remember that you always have the right to call someone out on an inappropriate question and let them know that you're not comfortable answering what they're asking.

People are generally inquisitive, they're just most likely intrigued, however you shouldn't feel pressured to answer any questions you don't feel comfortable asking.

I have often wondered the same thing, generally people are just insensitive and curious. The best thing is to educate them and let them know it's rude to ask. If you don't go around asking why they are straight they shouldn't do the same

It is human nature to bed curious or even hostile about things one has yet to experience within themselves. I often find myself questioning people about things i don't understand.

Most the time, people are just being curious. They don't mean to overstep, but end up doing so. It's natural human instinct to wonder.