No. No need to wear jock straps during any form of swimming, normal swimming trunks will suffice
You can wear a jock strap to hold a protective cup in place, if it has a pouch for it. Jock straps are also worn to hold the penis and testicles in place while you work out.
Yes, many runners do.
they get paid in jock straps
Yes. With stupid boys arround now, being hit in the privates at a young age can be very upsetting in later life.
Gay guys have the same genitals as straight guys. Anyone regardless of sexual orientation might choose to use jock straps for certain sports.
Yes. Some wear a jockstrap , wrestling shorts/speedo or nothing under their singlets.
jock straps are for only sport it is up to you what you wear i wear boxers i may start wear Calvin klein brifes