This is a very honest, precautious, curious and wonderful scene. You can gauge the rough guy's uncertain, yet yearning, desire. The other chap is knowledgeable and guides him assuredly. It's so well done it's way. Almost touching ..
Every heterosexual man sees one day how his preference for women falters and has the curiosity or desire to experience what that other type of love will be like. There is nothing more delicious than being another man's first man and teaching him to discover, belatedly but profitably, the pleasure of fucking and being fucked by a comrade.