The following article was sourced from a Wikipedia page at the following address: http://en.wikipedia.org/wiki/Underpants
Underpants are a man's undergarment covering the body from the waist or hips to the top of the thighs or knees.
TYPES OF UNDERPANTS
Boxer shorts, boxers, or trunks have an elasticated waistband that is at or near the wearer's waist, while the leg sections are fairly loose and extend to the mid-thigh. There is usually a fly, either with or without buttons. The waistbands of boxer shorts are usually wider than those of briefs, and often bear the brand name of the manufacturer.
Boxer briefs are similar in style to boxer shorts, but are generally shorter and form-fitting like briefs.
Sometimes boxer briefs are called trunks, but see next section.
Trunks are shorter than boxer briefs but longer than briefs.
Briefs have an elasticated waistband at or near the wearer's waist, and leg sections that end at or near the groin. They also come in ultra-absorbent varieties.
Thongs are like briefs, except the backside is made to go between the buttocks.
To read more about underpants, please click on the following link: http://en.wikipedia.org/wiki/Underpants