u/Calm-Hearing4742

I don’t get why people do this in posts on reddit. For example, yesterday I saw one person say that she’s a “28 year old girl”. I‘m 19M and I don’t even refer to myself as a “19 year old boy”. It does make more sense if you‘re a teenager though or maybe early 20s at most, but after that it seems even weirder/more immature, especially if you’re 30+ still calling yourself that. It’s like people infantilize themselves

The reason I’m asking is because I’ve seen some people in this sub saying premarital sex was never actually considered a sin. I thought that the Bible made it clear that it’s sinful though. 

If you don’t believe premarital sex is a sin, can you explain why? I’m just curious as to why some people, even Christians, believe that biblically it isn’t.