What causes my testicles to swell slightly and tighten during intercourse?  It only happens occasionally, there is no pain involved and it causes premature ejaculation rather spontaniously.  It looks like Ive only go one large testicle, they only pull up slightly.  Thank you in advance.
Hello, During ejaculation scrotal muscles contract, that might cause some sort of painful sensations. However, if it is unbearable then you need to visit you, urologist, for a complete checkup and look for any pathology as well.  Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.