Robert Downey Jr. says Tobey Maguire put lip gloss on before the pair's 'Tropic Thunder' love scene.

The actor — who appears alongside Ben Stiller and Jack Black in the new comedy — had to shoot a trailer with Tobey for spoof movie 'Satan's Alley', which is shown before 'Tropic Thunder', in which the actors star as priests involved in a gay relationship.

When asked how he felt about the trailer, Downey Jr. replied: "I think Tobey was wearing lip gloss — it smelt very strong."

Stiller, who also directs 'Tropic Thunder', explained the thinking behind the trailer segment — which also features adverts for movie parodies starring him and Black.

Speaking at London's exclusive Claridges Hotel, Stiller told BANG Showbiz: "We basically wanted to be able to set up the characters in the movie, since the movie is about actors and the main actors are movie stars it was a really unique way to be able to set up who these guys were. So it was based on that.

"It was fun to do those because it was such a specific kind of humour — it was fun to make fun of trailers because everybody likes them and likes watching them."