Does he mean that he likes to sit in a tub with strangers?
Native speaker’s answer
Rebecca
No, he means this in a sarcastic way. The way he expresses the experience ("moist" and "with strangers") shows that he finds this action undesirable. You can also pick up clues from his facial expression and flat tone of voice, which is devoid of excitement. "Nothing like X" can be used in a positive or negative way. Ex: Nothing like being late on your first day of work. Ex: Nothing like a nice cold ice cream on a hot summer day.