Vagina smell after sex? Pllzzz help

Okay, so I've had sex with my new boyfriend twice. Each time I've had sex with him my vagina smells terrible after and I have weird discharge. Its not clumpy like a yeast infection, but it has a weird texture. I was recently tested for all sexually transmitted diseases so I know I dont have anything. Im really confused on whats going on. Like, my vag smells like a dead animal. Im really frustrated because i normally do not have this problem. The only thing that I can think of is that he is kinda sweaty, and the bacteria is throwing off the ph balance?

Also, it clears up within a week or two, but then we have sex and I have the problem again.

Help :(