But what kind of gene might be involved in an overly friendly personality?

Smith is cordial with his players, although not overly friendly.

She looks familiar and is gracious but not overly friendly.

The service isn't overly friendly, but they do a good job.

At the same time, he must avoid becoming overly friendly and losing control of the interrogation.

The staff is pleasant and competent, without being either overly friendly or standoffish.

"I got overly friendly with Adam in the hot tub."

It doesn't impress me as having a staff or a clientele overly friendly to us.

She is extremely eccentric, often acting in a bizarre, overly friendly manner.

He wasn't trying to be overly friendly; he just needed the comfort of touching me.