Humza Yousaf took a swipe at SNP leadership rival Kate Forbes over her opposition to same sex marriage during the first party hustings.
Yousaf said gay Scots would have to look the next First Minister in the eye and know they would advance their rights.
Three candidates - Yousaf, Forbes and Ash Regan - went head to head in Cumbernauld in the contest to succeed Nicola Sturgeon.