You may be conflating Vorrik and Tuvok.
Vorrik turned his nose up at a bunch of random holographic fancy women.
Was the Doctor expecting him to have group sex, or just pick one?
Maybe if the Doctor had offered Vorrik a Hologram of B'Elanna, it would have worked?
Tuvok saw his holographic wife and got busy.
Tiny non-event.
Sorry to break it to you, having sex doesn’t necessarily cause a pregnancy.
Not to mention birth control.
I seem to remember that the hologram not being telepathic was in fact his big challenge, one he managed to overcome with a lot of discipline.
It's about babies.
"Spawning salmon".
He's not stopping until she is pregnant.
If she is on birth control, then he is never stopping, and at least one of them dies.
Although she's more likely to die of an atomized pelvis before he dies of dehydration.
The women probably also undergo an impressive biological change during pon farr where they almost can't not get pregnant, and a mental change where they will kill any one who gets in the way of their pregnancy including themselves, which means that as soon as pon Farr starts, they literally cannot take any more new birth control, and they will negate any preexisting birth control, because they are crazy. Crazy for babies.
Spock tried to hijack the Enterprise to get his end away, but you don't think a wife knows which combination of common house hold chemicals will cancel/negate her monthly birth control hypo?