can Transformers reproduce

No they can't. They're robots.

...Giggity. They don't procreate, but they have to make new baby-bots. I suggest reading this:
link
Copy/Paste that, and all will be revealed.

then if they can't reproduce while would primus bother to make them males and females.i just don't get it.but you know,whatever.i guess they can't

You might see the answer in Transformers 2, When megatron is talking to the fallen, he interrupts and says the hatchling will keep dying without the energy....

ew y the frick would they do that? but eh... i guess if frenzy can pop out of barricade and scorponok can come out of blackout its... highly impossible

No.

NOOOOOO