Book 41, Number 5251: sunan abu dawud
Narrated Umm Atiyyah al-Ansariyyah:
A woman used to perform circumcision in Medina. The Prophet (peace_be_upon_him) said to her: Do not cut severely as that is better for a woman and more desirable for a husband.
Book 2, Number 2.19.73: maliks muwatta
Yahya related to me from Malik from Ibn Shihab from Said ibn al-Musayyab that Umar ibn al-Khattab and Uthman ibn Affan and A'isha, the wife of the Prophet, may Allah bless him and grant him peace, used to say, "When the circumcised part touches the circumcised part, ghusl is obligatory."
The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “When a man sits between the four parts (arms and legs of his wife) and the one circumcised part touches the other, then ghusl is obligatory.” Narrated by Muslim, 349.
Al-Nawawi said in Sharh Muslim:
With regard to the phrase “and the one circumcised part touches the other
, then ghusl is obligatory”: the scholars said: what this means is when your penis disappears into her vagina; it does not mean touching in a real sense. That is because the circumcised part of a woman is above the vagina,
and the penis does not touch it during intercourse. The scholars are unanimously agreed that if he places his penis on the circumcised part and does not enter (the vagina), then no ghusl is required, neither for him nor for her. http://www.islamqa.com/en/ref/43479
How sahih are the male circumcision ones? Because these hadiths get dismissed by modernists, and used by traditionalists.
@Billy, I do wonder why circumcision become fashionable in America too.