Is it normal to have trouble having an orgasm after Tummy Tuck & Liposuction of the mons pubis? Is it permanent?

 After tummy tucks, the pubic area can be elevated and therefore stimulation is altered.  Eventually, most women figure out how to adjust for this and normal sexual function returns once the swelling and healing are complete.  If problems persist, you may want to discuss this with your gynecologist. 

I guess it depends how long ago your surgery was.  There may very well be residual swelling that is affecting the area.  It would be very unusual for a TT or lipo of the mons area to permanently affect one's ability to have an orgasm.  Maybe just needs a little tincture of time.