What are the differences between sun protection products?

I find choosing among all of the available sunscreens and sunblocks to be very confusing. Of the following three products I am currently using, which one is giving my skin the most protection: sunscreen SPF 30 with UVA, UVB, and IR sun protection; sunblock SPF 17 with UVA, UVB, and IR sun protection; or, sunblock SPF 50 with UVA and UVB sun protection? By the way, what is the difference between a sunSCREEN and a sunBLOCK?


Do mumps and swollen testes affect fertility?

I have a question about mumps: I had mumps while I was thirteen-years-old. I remembered that because of embarrassment. I was afraid to tell my parents about the inflammation (swelling of the testicles) at the same time I had mumps. I did not have treatment for the swelling of my testicles due to mumps. Later, the swelling went away about the same time as my mumps. Although I still can produce semen, I am deeply disturbed whether that swelling could have hindered my fertility (i.e., no production of sperm due to the blockage of the sperm channels).


Does dinner equal sex?

I was looking through your column and thought that I should ask your advice on a rather sensitive matter. I recently invited a guy over for dinner at my house. We had a great time together, yet he presumed that he was going to sleep with me and insisted that I had led him on during the main course of the evening. I do not see how this is possible, but this guy keeps on hassling me for sex and I do not want to lose him as a friend, but I really do not see him as a sexual partner. What should I do?