An argument in WA's Parliament over fly-in, fly-out work has ended with two politicians apologising to each other after one called "bulls--t" on the other and suggested his opponent might want to "start measuring d--k size".

One Nation MP Robin Scott delivered a statement to the Legislative Council on Thursday in support of FIFO work arrangements and said "it was an absolute disgrace that the FIFO industry is being blamed for suicides and break-ups of families and marriages".

A Western Australian upper house MP hit his opponent below the belt last week during an angry exchange over the mental health implications of FIFO work. Credit:Nathan Hondros

He said he stayed working FIFO before he entered Parliament because he was well paid.

"Most of the guys I know who got divorced in the FIFO industry got divorced because they spent their two weeks on site every night drinking, living the life of luxury," Mr Scott said.