If you are not enjoying penetrative sex as much as you used to then there must be a problem somewhere and if this problem is due to a loose vagina then you are simply ignorant and according to the law, ignorance is absolutely no excuse.
There are of course various reasons why a woman who used to have a tight vagina can loose that tightness, prime among this reasons is child birth.
During child birth, there is a very high tendency that your pelvic floor muscles will be weakened thus making you to feel certain looseness while having sex.
This would also significantly reduce the amount of pleasure that you can get from sex.
Child birth as we all know is a blessing and every mother looks forward to the day that she would be delivered of a baby through natural means but that you have had a baby does not in any way mean that you should no longer enjoy sex and if that is the reason why you are not currently enjoying sex then I am sorry because I would have to repeat the statement I made above, you are simply ignorant.
However, there is no need to panic because I was that ignorant too after I had my first baby but I quickly realized the role having a healthy and enjoyable sexual relationship with my husband would play in the sustenance of the bliss in my marriage so I set out to seek for ways to restore my vagina to it pre birth condition.
Guess what, I was very successful, I even think my vagina is tighter than it was before I had my baby and the most important aspect of the whole thing is that I achieved it naturally by engaging in very easy and routine vaginal tightening exercises, no sprays, creams, consumables and all of such.
I would advice you to quickly snap out of your ignorance and go online to access these vaginal tightening exercises for just a token but if you do not have the time to go through all the mountains of information that you would find there, then I will recommend that you use the same guide that I used to achieve a very commendable tightness in my vagina.