Could well be a saddle/fit issue.
I have to disagree with the move seat forward idea tho, as a very likely cause, is that it is contacting the saddle where it flares out, and that possibly the seat is too wide.
There is very little in cycling that should have any impact on them, but constant rubbing of your inner thighs could well cause them to be sore. Might want to try dropping the nose of your seat, or slide it back a tad. Moving it forward seems like it would just exacerbate any problem with contact.