Sometimes a fishy smell could be an infection or maybe just did not have time to wash that day
Bacterial vaginosis (BV)
The vagina naturally contains a mix of many different bacteria. In cases of BV, the number of certain bacteria increases, affecting the balance of chemicals in the vagina.
What leads to these changes in the levels of bacteria is not clear. BV is not classified as a sexually transmitted infection (STI), but you are at a higher risk of developing the condition if you are sexually active.
Women with BV may be able to pass the condition to other women they have sex with, although it is not clear how this happens.
There is no evidence to suggest that the bacteria causing BV can affect male sexual partners.
There are also a number of other factors that can increase your risk of developing BV, including using scented soaps or bubble baths, having an intrauterine device (IUD) fitted and using vaginal deodorant. BV is more common in women who use a coil for contraception and those who perform vaginal douching (cleaning out the vagina).