Oh about a million things. The big swing in hormones along can cause ED/libido loss temporarily for some. Then there’s the NPP which is a known erection killer. It can cause loss of libido and ED for a strong percentage of users that lasts a good while. Lastly the EQ is known to cause low E2 issue especially if you couple it with an AI. Low E2 is bad for libido way moreso than high.