You are referring to the first few verses of Genesis ch.6. The Hebrew word for angels is not used there. Instead, it says that Bnei Elohim consorted with people. The word Elohim, albeit a name of God, is not used exclusively to refer to God. It can mean a judge (Exodus ch.21). In Genesis 6, the Jewish commentaries say that the most important men (Bnei Elohim: judges, officers) consorted with women of the riff-raff, meaning that they abdicated their high status for the sake of random physical lust.
Additional Answer:
The Scripture explains that spirit beings (angels) do not/can not physically interact with humans in a sexual manner. God gave the gift of 'sex' to mankind to 'become one flesh' and to increase the population which is to eventually be given the opportunity to become childred of God in the spiritual world:
Luke 20:34-36New International Version (NIV)34 Jesus replied, "The people of this age marry and are given in marriage. 35 But those who are considered worthy of taking part in the age to come and in the resurrection from the dead will neither marry nor be given in marriage, 36 and they can no longer die; for they are like the angels. They are God's children, since they are children of the resurrection.
Several commentaries suggest that this beginning in Genesis 6 speaks to powerful men - perhaps those of the 1st apostasy of Nimrod and the children of Ham - taking women of the line of 'righteous' Shem for their pleasures.
Humans are different from angels, but however when they pass on to the beyond and they come to help other humans. They are like angels.
Angels
Angels don't date.
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In the Bible, angels are generally depicted as male, often referred to with masculine pronouns. However, angels are not considered to have a specific gender in the same way humans do, as they are spiritual beings.
No one, but he consorted with many women.
Humans do not become angels.
angels are either humans in heaven or an angel from the ancient times with Jesus sent down to earth guide you without being seen.
Angels and Arch angels are of different origin. Angels are mostly concerned with the faith-survival of humans come with us to the long lasting journey to Heaven, while arch angels perform administrative duties and do not accompany humans to paradise.
because humans made them male names, before male humans were named these names, they were simply genderless names.
Angels are helper. I would help, and help is not only limited to angels but humans are inclusive.
The general belief is that angels are a different species. That angels do not incarnate as humans and that humans do not become angels. It is believed, however, that sometimes an angel will take on the disguise of a human for a short period of time in order to do God's work, but not that they live entire lives as humans.