Boxers or Briefs? Which One?

I'm a lady....and box-briefs are what I like on my bf :) there are like tighter boxers, really hot

Your environment is important, in temperate climes briefs are okay as long as changed daily and personal hygiene is maintained, In hotter climes boxers allow air to circulate around the Privates, The reason the Testes are outside the body is to keep them cooler. In hot weather, sweat accumulates around the testes and sweat rash can prove very uncomfortable. Synthetic materials add to this so cotton underwear is good. Keep our tadpoles in a good environment.

Both boxers causally breifs wen I'm lifting, running ect.

Compression shorts. Dude I wear them all the time. Lifting, chillin, whatevs...