First let me say that there is a difference between theory and personal experience.
so yoga and sex, and catholic priests.
from my readings, a point of tantra and other limbs of yoga, is to move energy around. In tantra moving the sexual energy upward for a higher purpose, moving this energy from the lower chakras to higher ones.
so from that theory, or one similar, celibate people may run into problems, priests included. If someone decides to become celibate, the sexual energy is still there. SO the energy has two main places to go, one is out through the penis, another is up the channels into higher chakras. if one does nothing with this energy it sits there, sexual energy builds and builds, and desires an outlet. again, out through the penis, or up into the rest of the body.
Priests and other celibates who try to repress desires may run into problem because that energy stays there in the sex organ till it becomes so great that they feel they must release it somehow. also as they have taken a vow they may feel shame. So… add sexual desire plus guilt/shame and you have some unhealthy things going on. Put these two together and this is one possible way a celibate turns into a predator.
so if one decides to be celibate, it may be wise to figure out how to move this energy, for it is the energy of creation.
best to you
Brother Neil