Personality Vs Appearances in relationships

My opponent made an excellent point pertaining to the intents of starting a relationship above. I will be arguing two points. One refuting one of my opponent's claims and one supporting my claim.Pro claim : True Love shouldn't have to do with the appearance of an individual but their personalityCon claim : The subconscious start of a relationship is naturally intended to lead to the production of offspring (Warning the following content may be found not suitable for younger readers, continue at discretion) To start off, it is common to state true love as a deep, heartfelt connection between two individuals that is extremely difficult to break and will likely carry the couple through a long relationship. I am assuming that this is my opponent's definition as well. However this definition is a tad vague though. It is simply describing the emotions felt during "true love". A much more concrete description would be stating where these feelings come from. These emotions are triggered from hormones released in the brain. More specifically Oxytocin and Vasopressin. These hormones are associated with strong feeling of love and commitment. They are only spread when an individual feels very strongly about his significant other. They both influence social behaviors like trust and bonding. They make the individual more trustworthy and loving of his partner. They also play drastic roles in parenting of both sex's. In both women and men it is found to have an affect on their need to protect their young. The interesting thing about this hormone is that not only does it cause mammals to trust and bond with the other sex, but it also comes into play during childbirth and sex. Now my opponent has stated that sex is, in fact, NOT the cause of relationships being formed and continued. However since the same chemicals are secreted in the brain during not only bonding and love but also during sex and childbirth, that would go to show that according to our brains, reproduction and "true love" are merely two names given to the same thing. As I stated, oxytocin is secreted during sex. An even more critical factor for my argument is that these hormones peak during intercourse. For women, Vasopressin peaks during orgasm. For men, Vasopressin peaks during arousal and Oxytocin peaks during orgasm. So it would seem that our bodies decided that these chemicals are what makes us love someone not personality. Also it shows us that a relationship is only a stepping stone towards sex and further on to the creation of offspring. Before I start my next claim I would like to apologize to my opponent. The first round of this debate was for acceptance and my beginning argument should not have presented until round 2. As a result I have gained an undeserved advantage of having more slots to make my point than my opponent. HoweverThe opposition has pointed out a few fallacies in my opening statement. I would like to have a chance to refute them even though I shouldn't have been able to. The arguments are as follows:1. I based my argument solely around my beliefs and not off of factual evidence.2. Since the theory of evolution wasn't presented until 1858 that would mean that my argument isn't valid since without knowledge of this theory, a religious individual would only start a relationship for love and personality. I will admit, my first argument was based almost entirely my own speculation with a pinch of evolutionary science included. I feel I did not convey the evidence as thoroughly as I should have. In order to ensure a completely factual statement, I will present my next argument in a Claim/Fact format.Claim: All organisms need to reproduce.Fact: If an organism did not reproduce it would be phase into extinction and would no longer be aroundClaim: An organism must contain the attributes required to reproduce.Fact: without these qualities, reproduction would be impossibleClaim: Making the sex's more attracted to these qualities would promote successful reproductionFact: If a sex is drawn to the other sex with good reproductive qualities, sexual reproduction will occur more often and be more successfulClaim: Men are attracted to women with larger breasts and hips because it encourages reproductionFact: Large breasts are ideal for feeding offspring and large hips are useful for child bearingClaim: Humans are attracted to each other because this attraction promotes reproductionFact: All evidence stated above I would also like to point out a fallacy in my opponent's reasoning. He states that evolutionary effects could not have played a role in relationships before the theory of evolution was even conceived. The theory of evolution does not need to be present for it's effects to be. Therefore, the sexual tendencies and hormones acquired through evolution still affected the relationships of couples before it was known these causes existed as they are all subconscious.As a closing statement I would simply like to reinforce my points; "True Love", sexual reproduction, and childbirth all exhibit similar hormones and therefore show they are all linked and have little to do with the personality of the opposite sex. Relationships and the hormones that are exuded during them are the products of natural selection and are designed to make Sexual reproduction more likely and successful Humans are attracted to individuals of the opposite sex with certain qualities because those qualities make it more likely conception childbirth will go smoothly. In terms of reproductive success, Having a relationship with an individual who has attractive features is better.