Well, crap, I may get persnickety also. The plants could be getting "pollinated" which is the transfer of pollen from the anther of one flower to the stigma of another. Sometimes, even though a flower may be pollinated, it may not complete the process of "fertilization" which is the union of the sperm and egg which forms the zygote cell. Or something like that. So, I think Jmolinari was correct in his post.
Not that anybody really cares.....
I sure wish my tomatoes would take off.