Pantyhose with back seam drive me absolutely nuts. Back-seamed pantyhose (especially very sheer black or skin-coloured pantyhose with thin, “razor sharp” black seam) “work” better than full-fashioned stockings.
One small problem. If the seams are not straight, the biggest turn on turns into the biggest turn down. And it soooo difficult to straighten them up alone.
See 7 photos below and pantyhose and stockings with back seams on eBay.