Fruit of the LoomMen's Breathable Boxer Briefs, Moisture Wicking Underwear, Assorted Color Multipacks

If my waist says I should wear a small in these should I order medium since the reviews say they're sized smaller than expected?

Do they have an opening in front?

How is the room in the crotch area? My teen often complains his boxer briefs pinch his balls but he doesn’t like feeling unsupported with boxers?

For those thave worn these for a months or more, do these stretch out or get looser over time?