First of all, you’re talking to a Dermatologist, not a physican. Derms prescribe Finasteride, of course they want to downplay the risks associated with the drug.
Second, you’ll need to buck up and get over your fears and embarrasment about asking for help, no matter who you talk to. If you want to obtain Viagra, do so under your physician’s guidance and care.
Self-medicating is dangerous and is what got a lot of people into this mess in the first place.