I'm glad you took the question seriously, and your answer seems more in line with what I had intended.In all seriousness:
[sblock]It seems there are four aspects to this question, and most of the answer is at the discretion of the DM's opinion concerning Warforged nature, personality, purpose, and design:
Questions 1 and 2 are related to Warforged emotional capability and range. I imagine this would depend on the "programming", so to speak, of the Warforged. It's clear from generic D&D material that Warforged have more fully developed personalities than their creators originally intended.
- Can a Warforged love?
- Can a Warforged lust?
- Can a Warforged stimulate others sexually?
- Can a Warforged receive sexual stimulation?
Concerning Question 1, it seems love is quite the possibility, if a DM allows such a peculiar bond to form between a living organism and a machine. And if they can love, they can certainly see the appeal of strengthening that bond via the Question 3.
Lusting is a different matter, since its impetus is largely tied to Question 4.
Question 3's answer is easily yes, though the extent to which this can occur would vary largely depending on what sort of physical design they have, including different components and their shape, size, material, and function (e.g., vibrating or warming).
Which brings us to question 4. Given standard D&D assumptions about them being created for war, it's safe to assume they weren't created with any sort of genitalia. However, as with any anthropomorphic creations we have, they certainly could be given them, at the time of creation or at some point afterward. Whether said genitalia also have any sort of pleasure receptors would also be a different consideration. But if they do, it's safe to assume a Warforged with such components would have an incentive for using them, hence the relation to the lust question above.
Notice that I didn't mention procreation. Remember that infertile people can fall in love and have sex, so that shouldn't be an issue in and of itself. Love and sex don't have to be tied to procreation, they just typically are since that's the sort of creatures we are. At least, that's my 2cp.[/sblock]
In short, it's up to the DM, but I imagine WOTC's official answer would be no.
See I don't intend to write whore-forged or anything like that, but I have a PC who has declared that he has been sending via House Sivis, information about the natural world outside of Sharn. The player declared that the his pen pal would be a lab assistant named Zo.
He left it open for me to determine what gender or race Zo is, but said that his PC is excited to meet him/her -- they just arrived in Sharn -- "both in the formal sense of discussing how to create a bio-sanctuary, as well as the personal satisfaction of "geeking out" with someone who shares his enthusiasm."
If he gets laid in the process, that would just sweeten the deal. He says his character -- an eco-sensitive shifter -- claims he has "love for ALL living creatures" and is not kidding about that and in no uncertain terms, said he swings both ways.
I was thinking that Zo could be a Warforged as a) it's a Warforgey name, b) lab assistant makes an interesting but not out of line role for a Warforged and c) I could write the character as interested in the natural world and all its implications in a detached 'objective' sense.