Today, this Google query ended up here. It’s an interesting question, given that the rich reception of Gen. 6.1-4 only depicts male angels having sex with human women.
But the answer is simple: there are no female angels. In early Jewish literature, all angels are male.
Update 1: This important issue seems to have provoked interest. Jack Collins (Worthless Mysteries) comments below that Na’amah, the subject of speculation since being listed as the one female Cainite in Gen. 4:22b (see the genealogy in Gen. 4:17-22), ends up as a fallen angel in the Zohar. As she has sex with Adam, this counts as a female angel having sex with a man. But we’re well into medieval Judaism here. The same would go for Lilith traditions, which SP discusses in the comments section.
Update 2: And the Greek goddesses become angels in late Christian tradition. Nike, already winged in Greek iconography, is easily angelified, given the conflation of angels with the winged creatures.
Update 3: Jim Davila (Paleojudaica) points out “the four Hayyot (“living creatures” or “beasts”) of Ezekiel chapter 1 are grammatically female”. Grammatically, that is, but not in gender. Yet, what this means is a bit mysterious, as Jim points out, and they’re not precisely angels.
Update 4: Also in the comments section, SP points out that “in Targum Neofiti (on Gen. 6), the bene [ha]elohim take (אנשי(ן instead of women”. That is, the sons of the gods have sex with men rather than women. This might be a result of a problem in textual transmission, though, as the final nun is missing.
So it is still correct to say that, as far as the evidence of early Judaism goes, there are no female angels – and therefore no angels who have sex with men. Or have I missed some evidence of female angels in early Judaism….?