After marriage party?

Hi, I got married recently. My husband and his 3 best friends have a small custom, which I knew even before marriage. Whenever someone in their group of four gets married, after the honeymoon, they have a small party where the wife will be f***ed by other 3 friends of the husband. The same thing happened to other 3 persons wives and my husband did them all. This is a small pact among them. Now its my chance. Though inside I am a lot excited still I am also a bit hesitant. The day is going to come in a few days. I cannot say no, yet when I think about this my heart beat increases. What say?