I just found some quotes from Luther, Calvin and Zwingli on another forum. I am still wondering about Wesley since he came along many years later.
Marting Luther:
"Christ . . . was the only Son of Mary, and the Virgin Mary bore no children besides Him . . . I am inclined to agree with those who declare that 'brothers' really mean 'cousins' here, for Holy Writ and the Jews always call cousins brothers."
Pelikan, ibid., v.22:214-15 / Sermons on John, chaps. 1-4 (1539)
John Calvin:
"Helvidius displayed excessive ignorance in concluding that Mary must have had many sons, because Christ's 'brothers' are sometimes mentioned."
Harmony of Matthew, Mark & Luke, sec. 39 (Geneva, 1562), vol. 2 / From Calvin's Commentaries, tr. William Pringle, Grand Rapids, MI: Eerdmans, 1949, p.215; on Matthew 13:55
"Under the word 'brethren' the Hebrews include all cousins and other relations, whatever may be the degree of affinity."
Pringle, ibid., vol. I, p. 283 / Commentary on John, (7:3)
Ulrich Zwingli:
"I have never thought, still less taught, or declared publicly, anything concerning the subject of the ever Virgin Mary, Mother of our salvation, which could be considered dishonourable, impious, unworthy or evil . . . I believe with all my heart according to the word of holy gospel that this pure virgin bore for us the Son of God and that she remained, in the birth and after it, a pure and unsullied virgin, for eternity."
Thurian, ibid., p.76 / same sermon
Do the Calvinists and the Lutheran still believe that Mary was forever virgin? If not, when did they change?