Pleasure here doesn’t necessarily mean sexual or physical pleasure. One of the greatest joys for a person is to have a partner in whom he can find peace and tranquillity (as the Qur’an states in Sura ar-Rum). You build a family with this partner. You share your life. You have beautiful experiences. This beings humans one of the greatest joys in life. So here the Prophet (s) and the Imams (a) are highlighting how valuable women are and how much joy (wether spiritual, psychological or physical) they can bring to one’s life. This in fact came at a time when society viewed women as being inferior. Islam here is reminding people that women are the source of great joy, so don’t underestimate them. Appreciate them and value them.