new and needs help!

Hi, i'm new here, i hope you guys can help me with a problem i have. i love taking it up the ass more then my vagina. i've been with my current boyfriend since i was 18, i'm now 22. we've been sexuality active for all 4 years. my bf has a very VERY big cock. about 10inch and very thick. over the years my ass has taken a pounding (pun intended!) and over the years my ass hole has got very lose through all the sex (at least 4 times a week). i'm worried that my ass will continue to keep getting loser, have any of you guys had this kind of problem? we also go swinging now and again, i had a guy who was average ( about 7inc) and i couldn't even feel him! and i can tell that there is more room left when my bf fucks me, do u think if we stopped fucking my ass would go back to normal? don;t get me wrong i love his big dick but is this normal?!

many thanks