Yeah. Harry's crotch attracts multiple Doctors. IT'S ALL TRUE.
This one pointed out by
nostalgia_lj (I think): Pertwee, er... er... well, there seems to be crotch-touching involved. Of the vigorous sort, too. I leave the interpretation up to you.
And from the Genesis Of The Daleks DVD, Tom Baker commenting "see what I did there?" so I'm not imagining things. (Cap by the Mole.)
I'm sure there are more somewhere but I haven't found them yet. Although these two should be conclusive evidence of Harry's bits being magnetic.