Fluid is still ejaculated during sex after male ligation, but this fluid is often prostate fluid, para-urethral fluid, and is sperm-free.
Since semen consists mainly of seminal plasma and spermatozoa, seminal plasma also contains fluid secreted by the urethral bulbourethral glands as well as prostate fluid. In a normal person, sperms are produced in the testes, mature in the epididymis, and are transported through the vas deferens to the seminal vesicles for storage.
When a man has a ligation, which is a bilateral vasectomy, sperm cannot be transported to the seminal vesicles for expulsion from the body. However, the fluid secreted by the urethral bulbous glands and prostatic fluid can still be ejaculated through sex, through ejaculatory activity, when the ejaculated fluid is dilute, the semen is watery, there is no milky white fluid, and the fluid is free of sperms, and contains only the prostatic fluid and the para-urethral glandular fluids.
Therefore, after standard ligation, men can still have a normal sex life and still ejaculate fluid, but the ejaculated fluid does not contain sperm and will not have fertility, and the ligation will not affect the sexual function and sexual pleasure.