Strip club

So i asked my man what he wanted to do for his birhthday which is coming up soon. Hes been in this with asking me for a three some and to makeout with a girl. Which bothers me beacuse i belive a realtionship is between you and one other person anyway he said he was to go to the strip and see two girl make out. Im mad but he belives its no big deal i need an opion should i be mad