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Sukdulan (2003) - https://www.imdb.com/title/tt0350171/

Cheating wife

https://sinepinoy.net/sukdulan-2003/
http://www.pinoymovieonline.net/sukdulan-2003-full-hd-movies.html

Mulberry (1986)

Sam-po is a gambler living without concern for how his wife will manage their houselhold without his earning money. In order to get food and provisions, his wife An-hyeob, sleeps with various merchants in the village. One of the few men she does not sleep with, a lustful servant named Sam-dol, decides to reveal her activities to her husband for revenge.

My Wife's Lover (2015)

https://www.xnxx.com/video-9laih84/my_wife_lover_2015

El Chema TV Series -  https://en.wikipedia.org/wiki/El_Chema

Has many cheating scenes but no much nudity.

Available in Netflix which is paid. I didn't try to find a video link, if someone does please update.

Vikings TV Series -  https://www.imdb.com/title/tt2306299/?ref_=nv_sr_1

Has some cheating scenes but no much nudity.

http://putlocker32.com/search-full-movies/vikings.html

Spartacus (TV Series) -  https://www.imdb.com/title/tt1442449/

So far the best tv series with action, cheating sex etc. Haven't came across any other series to this level

http://putlocker32.com/search-full-movies/spartacus.html

Sugar Daddies (2014) - https://www.imdb.com/title/tt4329098/

Cheating Boyfriend with a sugar daddy, no nude scenes but I liked it. Watched this movie only for Taylor Black (she is really gorgeous)

http://streamm4u.com/watch/movie/sugar-daddies-2014.7994.html

Dagboek van een oude dwaas - www.imdb.com/title/tt0092816/

https://taboovideos.tv/free/986-diary-of-a-mad-old-man-1987.html

kiskanmak (2009) - about a married woman who has an affair with the son of a rich man

https://vimeo.com/181958212

www.imdb.com/title/tt0117594/?ref_=tt_urv - Segurista (1996)

http://www.pinoymovieonline.net/segurista-1996-full-movie.html

(or)

https://www.youtube.com/watch?v=Ug9fK0N1q1A