Wisey-
You brought up an excellent point The famous Gemara in Bava Basra
57b says that one can take a path with immodestly dressed woman if he has no other way to get to where he needs to get to. The question is, how far does this apply? Does it mean only Parnassah or Medical issues, real legitimate purposes, or even tiyulim (pleasure trips)?
DaasYochid- I think you are referring to IM YD (4:11:1) where Rav Moshe tz”l prohibits going to movie theaters because of Moshav Leitzim.
That is different then watching a movie at home. Rav Moshe does add:
?? ??? ????? ????”
“? ????’ ‘??”? ??????? ?????? ????? ?? ???’ ????? ?? ????? ??????’
That would apply even to movies at home.
It is best to read the whole teshuva:
http://www.hebrewbooks.org/pdfpager.aspx?req=922&st=&pgnum=212&hilite=