Which should have the higher boiling point, ethanol $\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\right.$, found in alcoholic beverages) or ethanethiol $\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{SH}\right.$, a foul-smelling liquid found in the urine of rabbits that have feasted on cabbage)?