华人估计常见,不知老外是否会想歪到三人行 or open relationship, 结果google标准答案显示场外听众猜歪了:
https://www.quora.com/How-should-I-respond-to-a-girl-who-asks-to-bring-a-friend-on-a-date
https://www.quora.com/How-should-I-respond-to-a-girl-who-asks-to-bring-a-friend-on-a-date