Louw & Nida Greek-English Lexicon on Revelation 14:4 and PARQENOS

"PARQENOS, OU [masculine]: an adult male who has not engaged in sexual relations with a woman- 'virgin, chaste.' hOUTOI EISIN hOI META GUNAIKWN OUK EMOLUNQHSAN PARQENOI GAR EISIN 'these are men who have not defiled themselves with women, for they are virgins' Re 14:4. It is very rare that the same term can be applied to a man who has not engaged in sexual relations with a woman as is used in speaking of a woman who has not had sexual relations with a man. In fact, in English the use of 'virgin' as applied to a man seems strange. In many languages there is simply no term for a man who is a virgin, since such a state is regarded as being unthinkable. However, the first part of this statement in Re 14:4 indicates clearly the state of the persons in question. But if one does attempt to find a satisfactory term, it is important to determine whether such a word implies homosexuality, for this tends to be the case in some languages. See also comments at 9.39."

See Semantic Domain 9.33.