Justin Bieber: "Wait for the person you're in love with"

Justin Bieber says you shouldn't have sex until you are "in love".

The Boyfriend singer - who performed for a screaming crowd at Sydney's Circular Quay this week - doesn't want his fans to rush into the bedroom and thinks it is better to wait until you meet the right person.

Speaking to Rolling Stone magazine, he said:

"I don't think you should have sex with anyone unless you love them.

Justin Bieber performs live on Sunrise with David Koch, July 18. Source: Getty

"I think you should just wait for the person you're ... in love with."

In the revealing feature, Justin - who has been in a relationship with Selena Gomez since 2011 - also reveals he is morally against abortion, although he accepts there are occasions when a termination is the right thing to do.

He said: "I really don't believe in abortion. I think (an embryo) is a human. It's like killing a baby."

Kochie present "the beibs" with a Sydney Kings jersy. Source: Getty

When asked if he thought abortion was acceptable in rape cases, he replied:

"Um. Well, I think that's really sad, but everything happens for a reason. I don't know how that would be a reason.

"I guess I haven't been in that position, so I wouldn't be able to judge that."

Justin also revealed he feels like more of a man since he turned 18 in March and the way he acts and behaves has become more mature.

He said: "I feel like I carry myself in a more manly way. I don't carry myself as a boy."