The advert was released as part of a romantic celebration for fashion retailers C&A.
Still recovering from the injury that has sidelined him since February 2018, Neymar and his girlfriend Marquezine starred in the raunchy television advert together.
In the 15-second clip, the Paris Saint-Germain star and Marquezine who is a Brazilian model could not keep their hands off each other.
The couple is just in their underwears in the video directed by Giampaolo Sgura.
The advert was released as part of a saucy Dia dos Namorados campaign for fashion retailers C&A.
The Dia dos Namorados is a romantic celebration, similar to Valentine's Day and celebrated on June 12 in Brazil.
Neymar and the 22-year-old Marquezine have been dating on and off for years but split before they rekindled their romance in early 2018.
The 26-year-old football star and his girlfriend Marquezine spent a lot of time together during his recovery time in Brazil.
Neymar who hasn't played since injury in February spearheaded the Brazil squad for the 2018 FIFA World Cup and his expected to be fit.
Brazil team doctor Rodrigo Lasmar said he was hopeful, with the bone's healing making "excellent progress."
Neymar should be able to "regain match fitness" when he takes part in friendlies against Croatia on June 3 and Austria on June 10, Lasmar said.