Im sorry is not working as you expected, some guns shot in a more realistic way, very different than call of duty in which the bullet goes from the center of the screen to the crosshair, this is not realistic because the bullet is not actually coming out from the center of the screen, in TVS the bullet actually comes out from the gun, this is important specially in close range since the distance proportion between the camera, gun and hit point is big. Also darts and Pong balls work the same plus they are affected by physics.
To use the dildo you grab it and put it close to the genitals, it should snap in place and then press the mouse click to move it. You can also use the scroll wheel to adjust the distance you are grabbing it.
I'm not sure what are the technical differences between PC and Mac, I think the game runs on Metal in Mac which is not as performant as openGL which is the case for Windows. Also and usually PCs tend to be more powerful than PCs, I don't know if this is your case.
Thanks for reaching out and let me know if there is anything else I can do to help.
Regards