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Its difficult to maintain relationships when you have MCS. Its more difficult to find a partner. Not impossible, but difficult. The statistic for marriages ending in divorce when one partner gets MCS are 98%. Its very difficult for the "normal" partner to understand, or live within the framework of, that which they can't perceive. The same applies to friends and family. As a hypersensitive, you ask them not to wear fragrance, they think they aren't if they just don't re-apply. They can't perceive the fragrance that is still in their clothes, coat, car, and purse that they contaminated themselves, and now you with. It makes for hostile feelings on both sides. It becomes too burdensome for the normals to want to do what it takes to be around you safely.
As for partners... Everybodies chemical sensitivities are different. What triggers one, may or may not, trigger another. As an example: I'm o.k. With animals. Many of my hypersensitive friends aren't. I can't do any toxic substances. Some of my friends its just specific classes of chemicals. Finding a partner who has similar sensitivities as you may be extremely difficult.
The other thing is, you may not be able to have sex. Body fluids carry toxins. Exchanging body fluids can cause severe reactions in one or both partners.