Al-Baqarah 2:222 ويسالونك عن المحيض قل هو اذى فاعتزلوا النساء في المحيض ولا تقربوهن حتى يطهرن فاذا تطهرن فاتوهن من حيث امركم الله ان الله يحب التوابين ويحب المتطهرين ٢٢٢

They ask you concerning menstruation. Say: that is an Adha (a harmful thing for a husband to have a sexual intercourse with his wife while she is having her menses), therefore keep away from women during menses and go not unto them till they are purified (from menses and have taken a bath). And when they have purified themselves, then go in unto them as Allâh has ordained for you (go in unto them in any manner as long as it is in their vagina). Truly, Allâh loves those who turn unto Him in repentance and loves those who purify themselves (by taking a bath and cleaning and washing thoroughly their private parts, bodies, for their prayers).