[adpiucf]

Sounds like assault and battery. And if the below occurred, then yes, that is sexual assault: The wrestlers explained the sexual assault charges against three juveniles as "knifing" or "goosing," a common prank where a person surprises someone by holding their hand straight out and whipping someone in the rear.
But a relative of one of the accusers said the sexual assault occurred when some team members put condoms on their fingers and sexually assaulted a teammate.
"[Goosing] was not a freshmen thing," said Eric Grogan, a former team captain who graduated last year and did not attend the party. "If you screwed up in practice, people did that to you."

Enough of this "boys will be boys" nonsense. They are old enough to know better and their parents have failed in teaching them to respect others... and their coach failed in properly coaching these young men--- respect for one's teammates is part of being "one of the guys"-- not violating your team member with a condom-covered finger or beating him.

ETA: However, minors should not be interrogated without a legal guardian present.