Are all Angels feminine?
The term "angel" actually means "messenger". Contextually we assume this means a "messenger of God" of non-human origin.
The angelic image of a "woman with wings" comes from Revelation 12:14: But the woman was given two wings of a great eagle, that she might fly into the wilderness to her place,
Other places in scripture indicate that angels are not all that human looking at all. In Revelation 4, there are references to "creatures" and in Ezekiel they are also refered to as "creatures" .
In Genesis 18 and 19 the angels appear to be human and masculine. They also appeared to be masculine and human in all of the resurection accounts.
However, all appearances of humanity, masculinity and feminity are apparently symbolic. Because Jesus says in Matthew 22:30 that angels don't marry, thus implying a "sexless" species. (Which makes a lot of sense for an imortal race.)
In Hebrews 1:14, it says that angels are ministering spirits, sent to minister to those who will inherit salvation. This is the role the angels played in Matthew 4:11 and also in 1 Kings 19.
So, humanity, masculinity and femininty are simply matters of perception, that seem to be specific to the specific manifestation of the angelic presences.