Why nowadays people have sex before marriage?

They are Horney. Not hard to figure out.

Because they do not want to wait until they are married to get it.

People been having sex before marriage since I have been on this Earth. and that is over 40 years.

People been having sex before marriage for years, maybe even decades. They have sex before marriage for several reasons. One reason is that they may be in a serious relationship and plan to get married.

it's not just nowadays. it's just in the open now.

People have always had sex before marriage. They just don't have to sneak around to do it anymore, because it will no longer ruin their reputation, career, etc.

Temptation and no religious affiliation.