The only thing that sticks clutch plates together is cold oil and viscosity. My bikes never suffer from that, probably because they never sits still long enough. The clutch has an inner and an outer, where the fibre discs engage with the outer, driven from the crankshaft, and the steel discs engage with the inner and drive the gearbox input.
When the engine is in neutral, the clutch spins as one unit, but when you drop into 1st gear with the clutch lever pulled, the inner will quickly stop and the outer carries on spinning, which is why there is often a bit of a clonk.
I'd suggest letting the engine get up to a good operating temperature as that will give the clutch a chance to be bathed in nice hot oil. At that point I would shut off the engine and put the bike in gear with the clutch pulled, and then try rocking the bike back and forth to free up the sticky plates.
If you need to get to it, clutch disassembly is no big deal but you will need a spare gasket and the patience to scrape off the old one without galling the mating surface. You can do it without dropping the oil, on the sidestand. Just don't drop foreign objects into the open sump...I just swing the case to the side and hang it up so I don't need to do anything with the ignition pulser wires. My 6th gen is below but the 5th is basically identical. Remove the 5 bolts and the clutch can be easily pulled apart, but use a torque wrench and go softly when rebuilding it.