Just because you love someone does not mean you should marry them. It has to be someone you can live with the rest of your life. If you think you can fix a relationship, whether it be sexual problems, or otherwise in nature, after or by getting married you are in up against long odds.
If you want to write a bunch of sappy posts about how love can conquer all kinds of problems and this and that fine, go ahead and pull the wool over this kids eyes. I mean what the hell - in 5 years when he is going through hell with his divorce you wont even be posting here any longer.
Im getting married once, to somebody I can share the rest of my life with.