My BFs cum irritates my lady parts??

Savannah 🌻

okay so like.. after my boyfriend and I don’t have sex for say.. a week or so, and we have sex again for the first time, his cum kinda irritates something in my nether-regions. I think it’s my urinary tract but i’m not completely sure?? It only irritates for the first time and then if we have sex a few days in a row it’s fine. Before anyone asks, yes I pee after sex. Any ideas as to why this happens??