So there is no true contact when you make the American R, not in the back and not in the front part of the tongue, " r" .

所以当你发美式 R 音时，舌头没有碰到嘴巴的任何地方，舌头只是向后运动。

As far as we know at the moment is that is still true direct close contact but of course more research is needed to either establish or discard the fact that it can be transmitted sexually.

就我们目前所知，这仍然是真正的直接密切接触，但当然需要更多的研究来确立或摒弃它可以通过性传播的事实。