The Japanese movie Side Job (Kanojo no jinsei wa machigai janai) features a few great sex scenes with the stunning actress Kumi Takiuchi, playing a woman dabbling in prostitution.
The best scene shows Takiuchi as the delivery health call girl down on all fours, her butt up in the air as she jerks and sucks off a lucky guy lying on a love hotel bed. (Not surprisingly, much of the film takes place in love hotel rooms.)
The film is directed by Ryuichi Hiroki (based on his debut novel), who previously made Kabukicho Love Hotel (Sayonara Kabukicho) — which features a fair bit of sex and nudity, including an amazing sex scene with South Korean actress Lee Eun-woo.
Takiuchi (28) also starred in Twisted Justice (2016), in which Haruna Yabuki has a sex scene showing off her breasts, and the film Greatful Dead (2014), with a somewhat bloody and disturbing nude scene.