I have some very good friends who have just got married and they are looking into surrogacy in order to start their family. They are both men.
When we were discussing it recently I realised that I feel really uncomfortable with it, and I'd like to examine why.
I'm pretty certain that it isn't homophobia - I have no sense of discomfort or unease with gay couples being parents, although I'm very happy to be challenged and really analyse my views here, in case I do have any latent homophobia. 
My instinct tells me that it is related to a feeling that I have that biology is increasingly being disregarded. I've been reading the trans threads with interest and somehow my feelings of discomfort about gay men using surrogates feels linked but in ways I'm not completely able to articulate. I think I'm concerned that although of course gay men suffer from homophobic attacks and prejudice, my friends are overall very privileged - highly educated, rich, white, and of course, male. The fact that they are willing and able to pay for a commercial surrogate abroad makes me consider the links to prostitution too - men paying for the use of underprivileged female bodies.
I'm sorry that this this is such a disjointed stream of consciousness. I'm quite new to feminism and I'm trying to really think about things in light of the reading I've done so far. I'd be very interested to read other people's perspectives on this - and I hope it will help me to develop my own views as well.