What's the maximum safe temperature for onaholes warming? Safe for your dick, I mean. Last night I warmed up my ona with one of those shitty 5V USB blankets, it can barely even stay warm normally so I wrapped the ona with the USB blanket and then in wrapped it all up in my bedsheets for about 30 minutes to keep the heat in. Worked out pretty well, too well even and I think the internal temperature was at 50 to 60 when I inserted, hope I won't find out later that I damaged my dick by fucking it.