点解做全身麻醉手術（右前手臂）駁骨，手術袍內不能穿底褲（男問），是否男女一樣都係？

1. Under general anesthesia, you don't have control of your bladder. So a catheter will be used to redirect your urine to a urinary bag.

Hence - no underwear.

(It is also why no eating is allowed before any major surgeries.)

2. Yes.

...................................可能你底褲污糟邋遢未消毒