It is not because he or anybody is an obstacle. All obstacles are within us. Normally, our physical body and biology are hardwired to respond to physical touches from the other gender in certain ways, especially when the mind has accepted the person as a partner. However, there are two conditions in which the physical body would not respond to the touch or experience a blanking out. First is because the very body shrinks at close physical contact and does not feel comfortable with the actual physical intimacy. There is no need to think much about it, especially if you are not married or are not thinking of marrying him. You could then take it as a natural indication of a lack of affinity in the physical. The body, too, has its own unique affinities and responds readily to them. So the description of the response suggests that there is possibly a lack of physical affinity at the physical level. It is not necessarily something bad; rather could also be, as I mentioned in my previous letter, the sign of a more evolved inner being that does not respond to animal vibrations.
The second reason could be a flooding by too many sensations and emotions that you are unable to handle, resulting in a blackout. In any case, it does not indicate any general incompatibility with the person but only a lack of response in the physical, which can be due to very different reasons. If the boy is fine with it and the two of you feel otherwise comfortable and happy with each other, especially if your core aspiration is similar, then there is no basic incompatibility.
Affectionately,
Alok Da
