I don't care about efficiency, I just wanna know what type of room heating system do you, from experience know makes an unheated room get naked sex ready (or more) asap. At least quick enough so you can turn it on before you leave for a date and come back in an hour or so?

Oil radiator? Electric grid ventilator? Oscillating ceramic tower? Convector with turbo blowing? Glass convector? Infrared electric?