I've been experiencing a tightness in the perineum area whenever i reach orgasm lately, can this cause retrograde ejaculation?

No, you probably have spasm of the pelvic floor muscles and this condition does not cause retrograde ejaculation. If you are at risk of sexual transmitted disease, you should see a doctor for ruling out prostatitis which is a common cause of ejaculatory pain. If not, you should practice Kegel exercises daily for relieving the pelvic muscle spasm.

No