current - Parallel MOSFETs

When I went to school we had some basic circuit design and stuff like that. I learned that this was a bad idea:

^{simulate this circuit – Schematic created using CircuitLab}

Since the current will almost certainly not flow equally over these three fuses. But I have seen multiple circuits that uses parallel transistors and MOSFETs, like this:

^{simulate this circuit}

How does the current flow through these? Is it guaranteed to flow equally? If I have three MOSFETs that each can handle 1 A of current, will I be able to draw 3 A of current without frying one of the MOSFETs?