Does getting your butt rubbed/patted make you sleepy?

OK, I know it sounds sorta weird, but I rember the first time I got a full body massage, when they massaged my glutes, I didn't get aroused, but I got very relaxed and sleepy. Also, I had a boyfriend who would pat my butt, and again I didn't aroused, it just put me to sleep. Does this happen to anyone else or am I just weird?
Does getting your butt rubbed/patted make you sleepy?
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