Prolactin. Thst hormone is secreted right after cumming (usually). That causes hypersensitivity and losing sexual desire. That makes you don’t want to keep fucking and it makes you sleepy, something you might already know. The effect varies from every individual from dudes thst it wears off in 5 minutes, an hour or even a full day. Some lucky guys don’t produce this at all and can have multiple orgasms one after the other and don’t go limp. It’s the prolactin. I can’t find the study but they had a dude cumming like 5 times and he had low or no prolactin levels
Edit. Found the study https://pubmed.ncbi.nlm.nih.gov/11979330/
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