Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
As per your query regarding
vaginal lubrication, also you have proper lubrication and there is no need of any lubrication till 15 minutes of sex. But your intercourse length is more than an hour.
Now if you are trying to conceive, thus you needed a lubricant which does not make any damage to sperms.
1. You had already used little butter and you had a good experience. I also like to advise to use butter for the same. If you can make fresh butter on your own, it will be better from any other lubricant.
2. Whenever you want to try for a baby, I like to advise you as do not make long-duration intercourse of an hour, but try to get climax from both sides in fair timings like 10 to 15 minutes.
3. Try alternate days.
4. Use missionary position.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Nikul Patel