There are a number of reasons your climax feels less forceful on occasion, or why you don't produce as much semen day to day. However, if a one-time fluke turns into a pattern, you may have perceived ejaculate volume reduction (PEVR).
PEVR is exactly what the name suggests: a reduction in the amount of semen produced during ejaculation. With PEVR, you may find yourself sexually stimulated and feel the desire to climax but experience reduced ejaculatory force and volume, making for a less intense orgasm.
Even as one of the most common types of ejaculatory dysfunctions, PEVR can be difficult to address as a medical condition, since you are the only one who knows the look and feel of your normal orgasm.
A look at risk factors
The main cause of weakened ejaculation is aging. Simply put, the body, including the male reproductive center, gets weaker as you get older. However, weak ejaculation can happen for reasons outside