1) thats not how it works
and
2) you dont bust the nut
here is another way to think about it... everything in the universe is energy, so anything you potentially desire is simply an arrangement of atoms that we call energy.
in sex, an IMMENSE amount of energy is generated between the two people and this energy can be used to create things in the physical universe. for example, if one were to let the typical sex act come to its natural conclusion with the man ejaculating inside the woman,
the energy created is so strong it has the potential to CREATE A NEW HUMAN LIFE... thats the potency of the energy we are dealing with, in that it actually has the power to create physical life. sex energy=life in every species.
but one does not HAVE to use the sexual energy to create a new life. once the energy has been generated it can be used for any purpose your mind can imagine. and so what you do is focus the creative energy of the sexual act in a desired direction or on a desired outcome, and with you and your partners' power of manifestation (manifestation=intention + attention), you WILL your desire into your reality.
but it does not manifest in the manner you suggested (although it may, but not likely). its not "think about a million dollars and a million dollars pops up in a briefcase the next day." thats not how the universe works most of the time.
its more like the universe will increase the frequency of syncronicities in your life and increase your opportunities to engage in an experience that will lead you to your desired outcome.
but if you want to try it, just try healing your physical body through sex, its simple and anyone can do it their first time. healing yourself is the easiest thing to accomplish with "sex magic" and thats what most traditions use the sex energy for, to heal the body and replenish vitality.
the key to harnessing sex energy is really about the woman. it is within her mind and with her energy that physical things manifest. the man obviously plays an important role too but its the woman who is the key. a woman who is experienced in sex magic will be far more powerful with an ignorant male partner, than a male who is experienced in sex magic will have with an ignorant female partner.
because typically in sex it is the woman who receives the energy while the man gives it. which is why in 99% of cases the woman (if she is emotionally invested in the man) can always continue having sex, while the man has to stop.
nagas bust that nut and be like
while the female is like
because the woman receives the male energy. the entire act of sex is the man giving/losing his energy to the woman. and the practice of sex magic deals with balancing these polarities so that there is an energetic GIVE AND TAKE between the man and woman, as opposed to the norm of the woman taking energy while the man gives it.
so sexual energy is going to be created in every sexual act regardless, and its just a matter of what you want to do with the energy. you can manifest healing, you can manifest an abundance in your opportunity for cash flow, you can manifest a human life, or you can manifest any number of things... or, as in most cases, you cant do nothing and simply let the energy return to the ether.
it may sound crazy but trust me just read up on it. but first things first you gotta eliminate all preconceived notions about sex magic from your mind, because that will only inhibit your progress.
here are some good places to start:
Neotantra - Wikipedia, the free encyclopedia
Kama Sutra - Wikipedia, the free encyclopedia
Taoist sexual practices - Wikipedia, the free encyclopedia
Sex magic - Wikipedia, the free encyclopedia
another good resource is this guy:
Mantak Chia - Wikipedia, the free encyclopedia
he has written several books from beginner to advanced on cultivating sexual energy. very easy to read
The my mom say i look 26. Maybe yall dont see what she see 
i fux wit you vic
... and this was years ago. Dealing with multiple personalities and and mental trauma/repression has aged the poor man beyond his years.
Alchemy=chemistry? 