well mister alien who is just seeing humans for the first time ever, u see some humans really like eating delicious things, it is considered pleasurable, sex is also pleasurable infact it is often regarded by many as one of the most pleasurable things humans experience so sometimes as a joke humans compare eating really good food to sex. I know this might be a shock for u since u have never seen much less interacted with any humans ever but i assure u this is common and normal.

Best of luck in ur journey of discovery into human cultures.