What is the ruling of Islamic law on coital positions, looking at and enjoying the wife's private parts, foreplay during bathing, fulfilling the wife's desire to be treated roughly or hit during intercourse, and the husband asking his wife to wear jewelry or henna designs on specific parts of her body?

It is permissible for a husband and wife to engage in intercourse and foreplay in any manner or position, as long as penetration occurs in the front passage and no harm results to either of them. It is also permissible for each to look at the other's private parts. Likewise, it is permissible to apply henna and adornments to any part of the body, as long as no harm results therefrom.