I had an experience one time after playing soccer, when I and my friends were taking showers and we talked too much about girls, and every one of us got hard erections, and luckily we were all familiar with each other, so it wasn't anything.
我試過有一次打完波，同啲朋友沖涼時講得太多女，個個都扯到硬晒，好彩大家都熟，冇咩嘢。