The 'way' a human is born has been discovered and how it grows too but we haven't yet been able to substitute the 'Female womb'.
Genes and DNA can be deciphered but to make a 'particular perfect human' has been an impossibility.Cloning is copying Nature....but the characteristics would be restricted to a part and not an entirety.
The attraction of Males and Females is a natural one or else we would not have multiplied the way we do. So that is beyond personal control.As every person is 'unique' and so will respond differently to similar situations.
Humans all over the Earth have come up in different Geographical,Cultural,Educational,Social,Economical,Religious,...so on and so forth....conditions. Thereby their,Ethics,Morals,Habits,Parental/Teachings etc..etc... will differ...having no common grounds even in the same country.
Humans grew up with the law of the Jungle.Humans settled down and formed a 'civilized' society. The rules were made by a Male dominated or even a fully male group of thinkers.But they put sense into 'jungle' living.
The 'Survival of the fittest' and Might is right laws of Nature were put in control by Rules and regulations,Bans and censures....So then each male/female got a 'mate' for the most natural urge of sex with the institution of 'Marriage'
All this is quite serious and so is the requirement by each individual for food,water,sleep,sex,etc..So how do we balance all this?What about availability and need when one is away for days on end...Why do we always think of Ethics,morals,etc....all set by us humans?What about 'Mother Nature' who made us all.
All relations and relationships are human creations..The names we give and the restrictions we put....all due to prevention of 'inbreeding',wrong genetics,Blood groups...etc...
So a Friend could be a male or a female so a male-male is OK but a female-male is not if it is without sex...and vice-verse ? I just differ to go into thoughts of sitting as a "Judge" on every action of Humans..
Sanctimony is a human creation ...But when one lives in an educated developed society....one should compare an apple to an apple and not have any thought across the board.
Whether Indian or western...the human remains the same...
Here are some good references by modern studies...
A lot more can be said and explained...but this should give each a clear idea and keep Religion,Culture,Country,...(all man made) ...out of this!