Honestly anything regarding transmission other than direct contact with body fluid at this point may just b speculation. My personal belief is that it has found a way to transmit easier. I base that on the sheer size of the current outbreak. That does not mean it has gone airborne. Maybe it can survive in an aerosol, or maybe it has adapted to survive on surfaces longer. No one really knows for sure.

All we can do is look at the facts. And the facts are that it is spreading, and it is already straining resources of entire nations. Nothing spreads like that if it only method of transmission is sex, kissing, or various other forms of body fluid exchange. At least not that fast anyway.