What is the solution to the problem of not being able to consistently pray after intercourse due to the unavailability of a bathroom for major ablution?

You must perform ghusl (definition) (ritual purification bath) from janabah (definition) (state of ritual impurity due to sexual activity) when its cause is present, such as intercourse, as long as you are able to use water and can find it. You must repent to Allah for having missed some prayers, for intentionally abandoning prayer is one of the greatest sins. What was obligatory upon you was to perform ghusl, and if you were unable, then tayammum (definition) (dry ablution). You must now make up the missed prayers in order, and if you were aware of the impermissibility of your action, then you bear sin and must repent. If you were ignorant and your ignorance is excusable, then there is no sin upon you.