My boyfriend is having frequent ball pains, and during intercourse he cums within about a minute of having it. his balls are quite swollen also.

Swollen testicles: Swollen scrotum could be from hernia, hydrocele, tumor, infection, lymphatic blockage, torsion (twisting of testes blood supply) etc. Some of these causes are serious or emergencies. I would encourage him to get care real soon, at least at an urgent care center.

Premature ejaculatio: As many as 1 in 3 men may experience premature ejaculation (1 minute or less) during their life. If it is a chronic condition, it can be treated with counseling, specific behavioral techniques, topical anesthetics, or oral medications like SSRI antidepressants, tramadol, and PDE-5 inhibitors. Your boyfriend can talk to his doctor about it.