What I understand is that you are able to do and enjoy sex. It rules out possibility of sexual dysfunction. Regarding your question of not able to get aroused after one intercourse, I think it is very normal. Imagine, if you get to eat your fav dish, would you feel hungry immediately after? No, isnt it? Similarly, if you have good sex, the desire to do it repeatedly may not be there, which is very normal and healthy. You must look to have a quality sex , and not very frequent sex.
Next Steps
For further information regarding healthy intercourse practice and facts, you can ask me directly here in Practo.