1)My friend was asking if it is permissible to let his wife dominate him.also,is use of sex toys like dildo on private parts of wife and husband permissible in islam?

1. Nabi (Sallallaahu Alayhi Wasallam) has mentioned, 'Modesty is part of Imaan (faith).' It is, thus, necessary to behave in a modest manner and not adopt the immoral traits and habits of the Kuffaar. Domination is a practice of the shameless Kuffaar and it denobles man when Allah has honoured him. The use of sexual toys to enhance foreplay is permissible on condition that these toys do not cause any harm or contain any forbidden ingredients. Similarly, these toys should not be inserted into the female private part, except in the case of dire necessity. One should also ensure that he does not commit any Haraam act when acquiring these toys nor should he go to any places of Haraam, such as adult gift shops. Even though one will be going for a valid reason, he is sure to look at Haraam pictures and others who see him enter will probably entertain evil thoughts about him.
2. A Shaafi'ee should make Qadhaa of all the Fardh Salaats, viz. 2 Rakaats of Fajr, 4 of Dhuhr, 4 of Asr, 3 of Maghrib and 4 of Esha. If he wishes he can also make Qadhaa of the Sunnats and Witr Salaays. However, this is not necessary.
3. All our answers are given so that they are acted upon. However, the ideal situation would be that one consults a Mufti from his area whom he relies on and should act on whatever he directs you to do.

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai