Im not sure if there is a question to answer. My first response is if it makes you happy where is the harm or issue? I have always encouraged enjoying sexual activities of all types. Im not sure if you are a male or female nor if you mean you are using your own cum or someone else’s but in the end none of that matters. If there is some health benefit please share. As for me I have fallen asleep covered in man cream several times but not necessarily on purpose. I also enjoy a night out on the town while still covered in cum and smelling of sex. As for arm pits well it doesn’t do anything for me but if you enjoy it who am I to judge or suggest you stop doing it? Have fun and enjoy sex and dont worry about what others think.