I dry humped with my girlfriend while both of us were wearing only our underwears, I didn't ejaculate but did have some precum, she was wet too. My underwear is nylon and hers was cotton but two layered. I also did some fingering(over the underwear only). Her period is due next month but should we be worried? Is underwear dry humping safe? Would it be better if either/both of us wore two underwears, or should we refrain from dry humping in our underwears?