What makes you think that there won't be males and females in heaven?
A few reasons. The one below more direct.
Luke 20:34-36 Young's Literal Translation (YLT) And Jesus answering said to them, `The sons of this age do marry and are given in marriage, but those accounted worthy to obtain that age, and the rising again that is out of the dead, neither marry,
nor are they given in marriage;
for neither are they able to die any more -- for they are like messengers -- and they are sons of God, being sons of the rising again.
No number to keep tract of, all that the father did draw did come.
Remember the church is called the bride in respect to mankind "men and woman" as one new creation . What we are is not what we will be.
For neither are they
able to die any more . The lamb book of life the elect will be fulfilled on the last day . No commandment to be fruitful and multiply.
Another, the whole Church, Christ bride is considered the "mother of us all" as a segregate womb . Paul typified as a mother labored as in birth pains until Christ was formed in Timothy. Paul planted the incorruptible seed that could never die. God caused the growth
Paul again acting as a mother espoused Timothy as a chaste virgin bride to Christ our husband.
2 Corinthians 11:2For I am jealous over you with godly jealousy: for I have espoused you to one husband, that I may present you as a
chaste virgin to Christ.